Lumens to watts converter. Wattage to Brightness Comparison.

Lumens to watts converter In lighting, watts are used to indicate the power consumption of a light source. Jump To: LED Lumens to Watts conversion; Incandescent Lumens to Watts conversion; Halogen Lumens to Watts conversion Aug 9, 2015 · Converting Lumens to Watts. Watts to Lumens Calculator What are Watts and Lumens? Watts (W) is a unit of power that measures the rate of energy consumption. You can easily convert watts to lumens with this quick formula: Lumens=Watts×Luminous Efficacy (lm/W) Luminous efficacy depends on the type of light. Enter the Luminous Flux (in Lumens) Luminous flux refers to the total visible light output from a source. LED bulbs, which are the most efficient, consume only 22 watts for an efficiency of 73 lumens per watt. Convert lumens to watts easily with our Lumens to Watts Calculator. Understanding Watts vs Lumens. Energy saving lamps have high luminous efficacy (more lumens per watt). The usage steps are straightforward: firstly, identify the type of conversion needed, whether from lumens to watts or the other way around. Watts to lumens calculator . Here are some basic equations for each major bulb type: LED: Lumens = Watts x 80; CFL: Lumens = Watts x 70; Halogen: Lumens = Watts x 20; Incandescent: Lumens = Watts x 15; Metal Halide: Lumens = Watts x 60 Watts = Lumens / Efficiency (lumens per watt) For example, an LED with an efficiency of 75 lumens per watt would require 5. Luminous efficacy is the key factor behind this conversation. Make Lumens to Watts conversions quick and efficient with our online calculator, designed to simplify your lighting calculations and energy-efficient planning effortlessly. Watts and lumens. Enter the luminous flux in lumens and get the power in watts. Luminous flux in lumens (lm) to electric power in watts (W) calculator and how to calculate. Perfect for homeowners, businesses, and anyone seeking to make informed lighting choices. The use of lumens and lumens/watt rating in lighting design brings forth several Complete list of luminance units for conversion. Discover the perfect brightness calculations effortlessly convert watts to lumens now!. By contrast, the lumen is a unit of brightness, a measure of the total quantity of visible light emitted by a light source. Bulb manufacturers include this information and the equivalent wattage right on the packaging. To simplify the process of converting lumens to watts or vice versa, a lumen to watt calculator can be employed. 41 watts x 85 lumens per watt. In lighting, it represents the amount of electricity a light bulb uses. 1 lumen/square foot/steradian = 10. . Dec 9, 2024 · How to Use the Lumens to Watts Calculator. 83. If still aren’t quite sure how to convert lumens to watts—or watts to lumens—you are not alone. This is a measure of how well a light source converts energy (watts) into light (lumens). Step 3: Understand Efficacy (Lumens/Watt) Now that we understand watts and lumens, we can use both terms to come up with lumens per watt or “efficacy” (or “luminous efficacy”). Conversion Equation. The Lumen to Watt Formula Nov 29, 2024 · Formula for Lumens to Watts Conversion. Effekten P i watt (W) är lika med ljusflödet Φ V i lumen (lm), dividerat med ljuseffektiviteten η i lumen per watt (lm / W): P (W) = Φ V (lm) / η (lm / W) Lumen till wattbord Lumens to watts conversion Total energy consumption and lighting requirements are the top factors considered when choosing luminaires. Enter the luminous flux in lumens, luminous efficacy in lumens per watt and press the Calculate button to get the power in watts: * the predefined luminous efficacy values are typical / average values. 1 watt/sq. Lumens to watts calculator. ie; 1 sq. The old technology of tungsten incandescent bulbs only had an efficacy Effortlessly convert lumens to watts with our user-friendly calculator. ’ An example of the conversion chart’s usefulness is when selecting outdoor lighting, a 30 lumens LED bulb could be swapped with either 1. This online unit converter allows quick and accurate conversion between many units of measure, from one system to another. La puissance P en watts (W) est égale au flux lumineux Φ V en lumens (lm), divisé par l'efficacité lumineuse η en lumens par watt (lm / W): P (W) = Φ V (lm) / η (lm / W) 75 Watt bulb creates 1100 Lumens; 100 Watt bulb creates 1600 Lumens; 150 Watt bulb creates 2200 Lumens; 200-300 Watt bulb creates 2800-4800 Lumens; 500+ Watt bulb creates 6000+ Lumens; Other Light Bulb Qualities to Consider for Brightness. Since we know the efficiency of an LED bulb to convert energy to light is 73 lumens per watt it becomes easy to calculate. Lumens to Watts Conversion. 41 watts to produce 460 lumens. Usage: Consider the application of the lighting—ambient, task or accent—when selecting the correct lumen output for every space in the area. Luminous efficacy (lm/W) is a measure of how efficiently a light source converts power (watts) into visible light (lumens). The converter accommodates various input formats and units, allowing users to input power consumption in watts and, optionally, efficacy in lumens per watt (lm/W), calculate lumens per watt. Kalkylator för watt till lumen Lumen till watt beräkningsformel. Lumens is a unit of luminous flux (brightness), watts is a unit of power. Lighting is an essential part of our lives, and understanding the relationship between luminous flux (measured in lumens) and electric power (measured in watts) is crucial for making informed decisions about lighting choices and energy efficiency. 460 lumens = 5. Lumens to Watts Conversion Chart You can calculate watts from lumens and luminous efficacy. , the power needed for our light bulb to produce the specified amount of visible light, based on its luminous efficacy. Lumen and watt units represent different quantities, so you can't convert lumens to watts. For example, if you have a light bulb with a lumen rating of 800 and an efficiency of 80 lm/W, you can calculate the wattage as follows: watts = 800 lumens / 80 lm/W = 10 watts. 460 lumens / 85 lumens per watt = 5. However, lumens are only part of the story, the type of bulb you choose will also affect the look and feel Understanding the Lumens to Watts Calculator. To convert watts to lumens, one must know the light source’s luminous efficacy, expressed in lumens per watt (lm/W). With energy-efficient lighting like LEDs and CFLs, how many lumens are in a 60W bulb or 100W bulb depends on the lumen output of the bulb, not its energy use. High lumens/watt ratio equates to a more efficient bulb, and such bulbs come in handy when designing a space that needs abundant light while keeping energy consumption minimal. Input the luminous efficacy of your light source (remember that you can also use our built-in presets). Is 800 lumens really bright? 800 lumens would be considered bright for tasks like reading or working, but not excessively so. Keep in mind that actual wattage may vary slightly depending on the specific brand and model of the bulb, so it's always a good idea to check the manufacturer's . Jul 28, 2023 · Light Bulb Watts to Lumens Conversion Table. For example, an LED with an efficiency of 75 lumens per watt would require 6. Usando a eficácia luminosa mais elevada das lâmpadas LED (100 lm/W): Watts = 1000 lm / 100 lm/W = 10 W In the world of lighting, the balance between brightness and energy efficiency plays a crucial role. Some of the most energy to light efficient LED bulbs are now reaching over 120 lumens in Energy Star tests. Convert between watts (W) and lumens (lm) for a variety of different lightbulb efficiencies In the calculator, select Watts to Lumens as the conversion type, enter the value 35 and select the item Light bulb for comparison. How to Use? Using the Watts to Candlepower Calculator involves the following steps: Gather Information: Determine the electrical power (W) of the light source and the luminous efficacy (K) of the light source EXAMPLE of lumens to watts conversion . Enter luminous flux in lumens: lm: Enter light source: Or enter luminous efficacy in lumens per watt: lm/W : Power result in watts: W A calculator for converting luminous flux in lumens (lm) to electric power in watts (W). Using the Illuminance Converter Converter. May 3, 2024 · We can use this lumens to watts calculator to find the required LED bulb wattage, i. A 60-watt LED equivalent is 7-9 watts. Convert between lumens and watts for incandescent, halogen, CFL and LED lightbulbs. Save energy, save money, and light your space with our easy-to-use lumens to watts conversion app. Calculadora de watts para lúmens. After a click on the calculate button the luminous flux is displayed in lumens. Lumens measure the total amount of visible light emitted by a source, while watts quantify the energy consumption required to produce this light. Whether designing indoor or outdoor lighting layouts, evaluating lighting performance, or conducting energy audits, our calculator offers the flexibility Lumens to watts calculator Watts to lumens calculation. – Step 3: The calculator computes the solid angle using: Ω = 2π × (1 – cos(θ / 2)) – Step 4: It calculates the luminous flux (lumens) using: Φv = Iv × Ω Lumens to watts calculator * the predefined luminous efficacy values are typical / average values. How to Use the Candela to Lumen Calculator: – Step 1: Enter the luminous intensity in candela (cd). 25 watts to produce 500 lumens. Lux is used to measure the amount of light shining on a surface. Energia elétrica em watts (W) para calculadora de fluxo luminoso em lúmens (lm) e como calcular. e. Lumens (lm) measure the total amount of visible light emitted by a source. mt. As lumens measure the amount of light and watts the amount of power used to create that light, now efficiency is considerably better with LED, the wattage has become an outdated benchmark for brightness as a small amount of power will now create a lot of lumens. A potência P em watts (W) é igual ao fluxo luminoso Φ V em lumens (lm), dividido pela eficácia luminosa η em lumens por watt (lm / W): P (W) = Φ V (lm) / η (lm / W) In the photopic region, the peak at 555 nm is assigned a conversion value of 683 lumens per Watt. An equivalent compact fluorescents (CFL) bulb in light output (lumens) should consume only around 7 watts and LEDs approximately 6 watts. While watt measures the total light power, lumen measures the human eyes visible light power. To convert 420 lumens to watts, we Therefore, to convert lumens to watts, we divide the lumens by the efficiency. Luminous flux in lumens (lm) to electric power in watts (W) calculator. Different types of light sources have different luminous efficacies. Convert lumens to watts now while reducing your environmental footprint!. Watts to Lumens calculator It is a conversion calculator used to convert the electric power in watts (W) to the luminous flux in lumen (lm). Lumen. Lumens to watts Formula: Jul 31, 2024 · The lumen is a unit of luminous flux; lumens correspond to the amount of light emitted by a source, such as a lightbulb or a candle, regardless of direction. The result should serve as a guideline for the brightness of the new LED lights. Our lumens to watts Calculadora de lúmenes a vatios. You can calculate watts from lumens and luminous efficacy. Wattage to Brightness Comparison. Apr 6, 2024 · The Convert Lumens to Watts Calculator is an indispensable tool designed to bridge the understanding gap between lumens and watts, two pivotal metrics in the realm of lighting. To convert lumens to watts, you can use the following formula: watts = lumens/efficiency. Sep 4, 2022 · From the table, a 9-watt incandescent bulb is equivalent to a 1-watt LED bulb. The Watts to Candlepower Calculator employs this formula to perform the conversion. The lumens to watts ratio is also critical as it represents the bulb’s efficiency. The power P in watts (W) is equivalent to the brilliant motion φ V in lumens (lm), isolated by the glowing viability η in lumens per watt (lm/W): P (W) = φ V (lm) / η (lm/W) Lumens to watts table A CFL bulb consumes 26 W making its efficiency to be 61 lumens per watt. 480 lumens / 75 lumens per watt = 6. For instance: A 60W incandescent bulb produces approximately 800 lumens. Jun 26, 2024 · A rough 7:1 ratio is commonly used to quickly convert the equivalent wattage from incandescent to LED bulb. If you've bought an incandescent bulb measured in watts, you can use the watts to lumens conversion formula to find out lumens. The luminous flux Φ V in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W): Φ V (lm) = P (W) × η (lm/W) Watts to lumens calculation Dec 27, 2023 · Watts = Lumens / Luminous Efficacy For example, if a bulb has a luminous efficacy of 100 lumens per watt and produces 1000 lumens of light, the calculation would be: Watts = 1000 lumens / 100 lumens per watt Watts = 10 watts This means that the bulb consumes 10 watts of power to produce 1000 lumens of light. 426} \] where: \(N\) is the brightness in nits, \(L\) is the total lumens emitted by the Easily convert Watts to Lumens with our user-friendly watts to lumens converter! Whether you are upgrading your lighting or planning energy efficient solutions, our tool simplifies the process. A 150-watt incandescent bulb produces 2600 lumens of light, while an 18-23 watt LED gives off the equivalent. The power P in watts (W) is equal to the luminous flux Φ V in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W): P (W) = Φ V (lm Lightbulb brightness in general is measured in lumens (not watts). How many lumens are in a watt? Because lumens measure brightness and watts measure energy output, there is no simple method for converting wattage to lumens. The power P in watts (W) is equal to the luminous flux Φ V in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W): P (W) = Φ V (lm) / η (lm/W) Lumens to watts table Calculadora de watts para lúmens Fórmula de cálculo de lúmens para watts. A 40 watt incandescent filament bulb produces roughly 460 lumens. Our converter to convert lumens to watts. It is typically measured in lumens per watt (lm/W). For LED bulbs, a rough estimate is around 20 lumens per watt. Watts to lumens calculator Lumens to watts calculation formula. In this article, we will delve into the definition of Convert quickly and easily between Luminous flux in lumens (lm) to electric power in watts (W) calculator and how to calculate. 41 watts. Just enter power in watts or luminous efficacy and with just one click you get the Luminous flux result. Department of Energy has a useful converter for Lumens and Watts here Looking for lighting? SiteLites are very bright! The handheld model has 1,800 Lumens, that 22,626 candles worth of light! Click here to order. Lumen to Watt Calculator What are Lumens and Watts? Lumen (lm) is the SI unit of luminous flux, which measures the total amount of visible light emitted by a source. cm/steradian (at 555 nm Lumen to Watt Calculator. For CFL bulbs: Lumens Lumens = 62. Insira a potência em watts, a eficácia luminosa em lumens por watt e pressione o botão Calcular para obter o fluxo luminoso em lumens: Understanding Lumens & Watts. Most of us are familiar with the power ratings associated with lightbulbs measured in watts (25 watts, 40 watts and 100 watts are common examples). Understanding the concepts of conversion of the lumen to watt is An online conversion calculator that aids in the conversion of Watts to lumens. On average, an incandescent bulb produces around 14 lumens per watt, compared to 63 lumens for energy saving compact fluorescents (CFL) and 74 for LED bulbs. 7639104167 candela/square meter. For example, an LED with an efficiency Lumens to Watts Calculator: Shedding Light on Power Consumption. For example, an LED with an efficiency of 75 lumens per watt using 5. Apr 24, 2024 · Lumens to Watts Conversion Chart You can use lumens and watts charts to select energy-efficient light bulbs that provide the ideal amount of light. Halogen Bulbs Jul 26, 2024 · To convert 300 lux to watts in our lux to watts calculator, take the following steps: Enter 300 lux 300\ \text{lux} 300 lux into the "Illuminance" field. The outdated metric of using wattage to judge brightness is over, as LED lights use less power to produce the same amount of lumens and can differ according to design. Lumens (lm) is a unit of luminous flux, which measures the total amount of visible light emitted by a source. It has two text fields and two controls, the ‘Calculate’ and ‘Reset’ buttons. 25 watts Watts to Lumens conversion Electric power in watts (W) to luminous flux in lumens (lm) conversion calculator and how to convert. Common terms are ‘soft white 60,’ ‘warm light 60,’ and ’60 watt replacement. Get accurate results for LED, CFL, and incandescent bulbs. 4 watts Jul 19, 2024 · Typically, the formula for converting lumens to watts is: Lumens = Watts x Luminous Efficacy or Watts = Lumens/Luminous Efficacy . Lumens to Watts Conversion Chart Jun 26, 2024 · The lumens-to-watt conversion formula will be as follows: Watts = 800 lumens ÷ 80 lumens per watt = 10W. Practical Applications Free and easy to use online Lumens to Watt Calculator. SI unit of luminous flux is called as the lumens. 4 watts to produce 480 lumens. = 800 Feb 20, 2019 · How Can I Convert Watts to Lumens? The U. This same procedure can also apply in commercial areas that need to determine adequate brightness for bulbs between 100 and 10,000 lumens Fastly find how many watts you need to achieve your desired lumens, making your lighting decision a breeze. Luminous efficacy is a measure of how efficient a light source is at converting electrical power into visible light. Watt (W) is the SI unit of power, which measures the rate of energy transfer. Lumens is used to measure the total amount of visible light from any light source. Apr 6, 2024 · Exemplo de calculadora de conversão de lúmens em watts. Here is the lumens-to-wattage converter chart for your reference: Watts to Lumens Conversion . But figuring out how to do a lumens to watts conversion when you’re shopping for new light bulbs isn’t always easy. For example, the following table helps you understand the efficiency of different light bulbs. Even though the two are distinct properties, people convert lumens to watts when making buying decisions. Calculateur de watts en lumens Formule de calcul de lumens en watts. Where 'r' is the radius of the sphere in feet. For example, an LED with an efficiency of 80 lumens per watt would require 6. Enter the luminous flux in lumens, luminous efficacy in lumens per watt and press the Calculate button to get the power in watts: The lumen is a measure of the total "amount" of visible light. 76391 sq. So now a more accurate lumens to watts calculation is required to find out how much power your LED light will consume. Luminous Efficacy (Lumens per Watt) Luminous efficacy is a measure of how efficiently a light source produces visible light, expressed in lumens per watt. Apr 17, 2024 · 3. The lumens to watts conversion chart can help you easily convert lumens to watts or watts to lumens and compare equivalent wattage between incandescent, halogen, CFL, and LED bulbs when replacing bulbs without affecting the existing brightness. Where luminous efficacy is measured in lumens per watt (lm/W). Watts to lumens calculation. Enter the Luminous Efficacy (in Lumens per Watt) Watts to lumens calculator Lumens to watts calculation formula. In other words, it is the amount of light that actually falls on a given surface. The lumen is the unit of luminous flux, and is defined in terms of Oct 20, 2022 · But when you convert watts to lumens, you’ll find that a 2W LED is actually just as bright as a 25W incandescent bulb. = 75 x 15 =1125 Lumens. The watt is a unit of power. Dec 27, 2024 · Lumens vs Watts: More lumens = more light, but you want to balance it out with the wattage to avoid burning your house down. Apr 4, 2024 · The conversion of lumens to watts varies depending on the type of light source, but generally, for traditional incandescent bulbs, it’s about 10-15 lumens per watt. To convert 450 lumens to watts, we Aug 8, 2024 · This Lumens to Watts Conversion Chart provides an estimate of the wattage equivalents for different types of bulbs (incandescent, LED, and CFL) ]based on their light output in lumens. The lumen is the SI derived unit of luminous flux (symbol: lm). Calculadora de flujo luminoso en lúmenes (lm) a potencia eléctrica en vatios (W). 500 lumens / 80 lumens per watt = 6. Lux and lumens are related by the formula lumens = lux × area. As lâmpadas economizadoras de energia têm alta eficácia luminosa (mais lúmens por watt). Final Words. The power P in watts (W) is equal to the luminous flux Φ V in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W): P (W) = Φ V (lm The power in watts (W) is equal to the luminous flux in lumens (lm), divided by the luminous efficacy in lumens per watt (lm/W): Watts = Lumens / Efficiency. meter. Lumens to watts calculation formula. The power P in watts (W) is equal to the luminous flux Φ V in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W): P (W) = Φ V (lm) / η (lm/W) Lumens to watts table May 24, 2024 · The conversion from lumens to watts depends on the type of light source. The luminous flux Φ V in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W): Oct 3, 2024 · The conversion from lumens to nits is given by the formula: \[ N = \frac{L}{3. One luman is equal to 1/683 of watt light power. As lumens measure the amount of light and watts the amount of power used to create that light, the only accurate It is a conversion calculator that is used to convert the luminous flux in lumens (lm) to the electric power in watts (W). It indicates the total amount of visible light emitted from a source. Oct 31, 2023 · Thus, a bulb with a higher lumen-to-watt ratio delivers more light while using less power, which is ideal for efficiency. Therefore, 2000 lumens would be approximately equivalent to 100 watts. feet to sq. Apr 24, 2024 · How many lumens is a standard 60-watt bulb? A standard 60-watt incandescent bulb typically produces around 800 lumens. This conversion is observed since most people are more familiar with watts than with lumens. One of the key concepts that illuminate this balance is the conversion from lumens to watts. = 2250 ÷ 73 = 31 watts. As lumens measure the amount of light and watts the amount of power used to create that light, the only accurate way to calculate the luminous flux In conclusion, our Lumens to Watts Calculator reduces the luminous flux to power conversion process, providing a user-friendly experience for both professionals and learners. The watts to lumens conversion chart is given to understand these calculations. How to calculate Watts from Lumens Lumens to Watts conversion calculator that is used to convert the luminous flux in lumens to the luminous intensity in watts. Keep in mind, though, that these converters may not always be absolutely correct, but they’ll absolutely be close enough for you to make the LED switch in your home. Considere uma lâmpada LED que emite 1000 lumens. Lumens measure the amount of visible light emitted by a source, while watts measure the power consumption. INPUTS: Light intensity in Watts = 60 , Light intensity in lumens = 15 lm/watt OUTPUT: Light intensity in watts = 900 . Understanding Lumens vs Watts. Les lampes à économie d'énergie ont une efficacité lumineuse élevée (plus de lumens par watt). 5 or 2 watts, while 40 and 60 lumens require 3 and 4, respectively. Ingrese el flujo luminoso en lúmenes, la eficacia luminosa en lúmenes por vatio y presione el botón Calcular para obtener la potencia en vatios: Conversion Table of Lumens to Watts in Comparison With Different Lighting Sources (Source: The Lightbulb Company) The image above shows the lumens to watts conversion chart used by different lighting products and their lumen output. Lumen is the SI unit of Luminous Flux. Example: Convert 75 watts incandescent bulb if its efficiency is 15 watts per lumen and you asked to convert the energy to lumens per watt. ft. The power in watts (W) is equal to the luminous flux in lumens (lm), divided by the luminous efficacy in lumens per watt (lm/W): Watts = Lumens / Efficiency. Here are some basic formulas for calculating lumens based on different types of light bulbs: For LED bulbs: Lumens = Watts x 80 . So, for 1000 lumens, it would be approximately 67-100 watts. – Step 2: Enter the cone apex angle in degrees (°). Simplify lighting decisions and energy efficiency assessments with accurate conversions. 41 watts will create a luminous flux of 460 lumens. 2. Check the lumens to watts conversion chart with the formula. Conclusion: Lumens to watts conversion is a crucial method for assessing the efficiency and brightness of lighting products. The more the brighter the light looks the more the lumen rating is. Energisparlampor har hög ljuseffekt (mer lumen per watt). A 100-watt incandescent bulb produces 1600 lumens of light, while a 12-14 watt LED gives off the same. Lumens versus watts Understanding Lumens vs Watts. Lumens to Watts conversion Luminous flux in lumens (lm) to electric power in watts (W) calculator and how to convert. The reverse conversion follows the exact same principles, but you’d set the conversion type as watts to lumens before entering the key details into their corresponding fields. = 10. A 10W LED bulb might also produce 800 lumens. Lm/W Efficacy. Lumens to Watts Calculation. S. Example: Convert 1500 lumens of an LED bulb to watts. Converting lumens to watts can assist you in selecting the most efficient lighting for your home or workplace. A high amount of lux corresponds to a brightly lit surface. This conversion, expressed as "lumens to watts," helps us comprehend the relationship between the amount of light produced and the energy consumed. The foot-candle is equal to one lumen per square foot. In case, If you would like to use meters instead of feet, then convert sq. Energy saving lights have high brilliant adequacy (more lumens per watt). Enter the power in watts, the luminous efficacy in lumens per watt and press the Calculate button: 1600 Lumens to watts is typically 14 watts to 25 watts using LED, but is dependent on the efficiency of the light source. LED bulbs typically have an efficacy of 75-110 lumens per watt, making them significantly more efficient than traditional bulbs. It delivers accurate results based on the values entered in the text fields which makes it an effective calculator in performing the conversions. 1. How do I convert watt to lumen? To convert watt to lumen, you need to multiply watt by the luminous efficacy of the light source in lumens per watt. This calculator helps users convert lumens to watts. Luminous efficacy measures the efficiency of a light source in generating visible light. To calculate how many watts are needed for a certain number of lumens, use this simple formula: Watts = Lumens / Luminous Efficacy (lm/W) For example, if an LED bulb provides 900 lumens and has a luminous efficacy of 100 lumens per watt (lm/W), it uses only 9 watts of power. suym qrmup ssjawh domng hnddq mhlzir fxj kayuc xadzg lgfh