![]() While watt measures the amount of energy consumption, lumens measure the brightness of the light. If you want to know the savings in electricity you would have each month by taking the leap to efficient lighting, here is a link to a LED savings calculator that will let you know how long it will take you to amortize the purchase of all the light bulbs in your home. The concept of lumens is different from watts. or the incandescent bulbs that are no longer manufactured.īelow you have a comparative table in which you can see how at equal lumens, an incandescent bulb consumes significantly more power than the LED equivalent: Lumens The efficiency index is what determines the energy savings, and therefore LED bulbs are more energy efficient than halogen bulbs. Lumens to watts calculation formula Energy saving lamps have high luminous efficacy (more lumens per watt). An equivalent compact fluorescents (CFL) bulb in light output (lumens) should consume only. Learn to compare lumens to watts and how newer LED bulbs and lamps compare to the traditional incandescent, metal halide, and fluorescent lamp wattages. η (lm/W)The luminous efficacy or luminous efficiency index of the source is expressed in lumens per watt (lm/w).Īfter performing the operation, the value obtained is the power in watts. A 40 watt incandescent filament bulb produces roughly 460 lumens.Φ V(lm)is the luminous flux expressed in lumens or lm I am guesstimating that 1 watt of 470 nm blue LED light is typically 70 lumens.
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