Step 3: Understand Efficacy (Lumens/Watt)Ī watt of electricity is equivalent to one lumen of light, so lumens per watt is a measure of how efficient light is. Lumens are used as a measure of perceived brightness and the total amount of light emitted by a source, though this can be misleading due to contextual factors such as the adequate size and distance between the source and object being measured. Incandescent lights give off heat, whereas LED lights do not emit heat.Ī lumen (symbol: lm) is a unit of luminous flux and a derived unit of light.Incandescent bulbs last longer than LED lights but become less efficient, while LEDs don’t lose any efficiency over time and use less electricity overall. The overall brightness of these two bulbs-how much light they emit-is similar however, there are several significant differences between them: A standard 60W incandescent bulb has about the same brightness as an 8-watt LED bulb, which isn’t very bright at all!Īn incandescent light bulb emits approximately 800 lumens each hour and consumes 100 watts. The most common measurement for wattage is watts (W), although it can also be measured in kilowatts (kW). To convert watts to lumens, you’ll need to know the amount of energy a light bulb uses.
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