![]() 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):įor example, an LED with an efficiency of 80 lumens per watt would require 5 watts to produce 400 lumens. LUMENS/WATT CALCULATOR Select Room type Bedroom Drawing room Kitchen Passage/lobby Balcony/Stairs Conference Pantry Office Party hall Waiting Warehouse. So now a more accurate lumens to watts calculation is required to find out how much power your LED light will consume. 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. LED Lights: 50 lm to 250 lm/W (varies widely by LED).We have used the rule of thumb below for this calculator. It has two text fields and two controls, the ‘Calculate’ and ‘Reset’ buttons. Compact Fluorescent Lights (CFLs): 60-90 lm/W Watts 1000 Candelas 100 Lumens/Watt 10 Watts However, without knowing the luminous efficacy of the light source, it is not possible to convert a candela to watts. 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).It is measured in lumens per watt (lm/W) or light output per watt.Ī higher efficacy means more light for the same amount of power, with different light types and even different models within a light type varying quite a bit.įor reference, here are some average lm/W efficacies for various light types: To convert 400 lumens to watts, we first need to know the efficacy of the light source.Įfficacy is a measure of how well a light source produces visible light. ![]() Understanding Lumens vs WattsĪs lumens measure the amount of light and watts the amount of power used to create that light, the only accurate way to calculate the power consumption in Watts, is to know how efficient the light source is. To achieve 400 lumens output an IP66 solar floodlight will use a 4W 6V panel to charge and power it. ![]() Just enter the lumens value and select the light source to get the corresponding watts value. Here are some example products and their corresponding wattages: LED Light Bulb A19Ī 400 lumens A19 2700K LED bulb will use 3.85 Watts 104 lm/W Candelabra LED BulbĪ 400 lumens B10 / B11 LED bulb will use 3.39 Watts 118 lm/W GU10 LED Par16 SpotĤ00 lm Philips Master Value LED Spot GU10 4000K PAR16 uses 5.19 Watts 77 lm/W LED Recessed Ceiling LightĪn 400 lumen recessed ceiling light requires 5.45 Watts 77 lm/W Fire Rated LED Can LightĪ recessed ceiling can light with an 400 lumen output requires 5.56W of circuit power 72 lm/W LED StripĪ 4.8 W/m K strip will use 4.71 Watts to create 400 lm 85 lm/W Solar Security Floodlight This is an online calculator to convert lumens to watts. Convert Into Multiply by To Convert Into Multiply by TABLE A.2a Continued. Not all LEDs require the same amount of power to create the same light output. lumens/sq ft foot-candles 1.0 lumen spherical candle power 0.07958 lumen watt. To known what is 400 lumens in watts, use each light source’s watts to lumens efficacy, typically:
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