The brightness of a light bulb was always conveniently by wattage, but that era is over. Less power is required with LED lighting to produce the same amount of lumens, so a new comparison needs to be made.
460 lumens of light on average is:
Not all LEDs require the same amount of power to create the same light output. Here are some example products and their corresponding wattages:
A 4.8 W/m 70 LED 3000K strip will use 4.84 Watts to create 460 lm @ 95 lm/W
A 460 lumens A19 2700K LED bulb will use 4.14 Watts @ 111 lm/W
A 460 lm LED Spot GU10 2700K PAR16 uses 4.95 Watts @ 93 lm/W
A 460 lumens B10 E12 Clear 2700K LED bulb will use 3.9 Watts @ 118 lm/W
A 460 lumen 3000K polycarbonate recessed ceiling light requires 5.29 Watts @ 87 lm/W
A recessed ceiling can light with an 460 lumen output requires 6.39 Watts @ 72 lm/W
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 power consumption in Watts, is to know how efficient the light source is.
To convert 460 lumens to Watts, we first need to know the efficacy of the light source.
Efficacy is a measure of how well a light source produces visible light. It is measured in lumens per watt (lm/W) or light output per watt.
A 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.
For reference, here are some average lm/W efficacies for various light types:
So now a more accurate lumens to watts calculation is required to find out how much power your LED light will consume.
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
For example, an LED with an efficiency of 75 lumens per watt would require 5.41 watts to produce 460 lumens.
460 lumens / 85 lumens per watt = 5.41 watts
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