We will need around 6 to 7 halogen bulbs to replace 1 single LED in order to generate the same brightness. So, we can see although they have the same wattage, after converting it to lumen, the halogen bulb has the lumen output of 200lm. Where luminous efficacy is the energy efficiency of the light source.įor instance, a LED bulb has 10W, and its luminous efficacy is 130 lm/W, so its lumen = 10W x 130lm/W = 1300lmįor instance, a halogen bulb has 10W, but the luminous efficacy is just 20lm/W, the lumen becomes 10W x 10lm/W = 200lm Lumen = Wattage of Bulb x Luminous Efficacy The formula converting lumens to watts is – Therefore, we need to accurately represent the brightness of the bulb through the conversion of wattage and lumens. About 95% of the input energy is converted into heat loss, so only about 5% of the energy is converted into light. Take the traditional tungsten bulb as an example. It should be noted that not all of the input energy becomes light output. If the bulb uses 50J energy per second, its power is 50W. The wattage reflects the power consumption of the bulb. By looking at different brands, we can find the LED bulbs having higher luminous efficiency up to 100 to 130 lumens per watt. In this example, the luminous efficiency is just 80 lumens per watt. Instead, it means this LED bulb is capable to replace 60 watts incandescent. It should be noted that 60W is not the power of bulb. For instance, the LED light bulb in the above photo has 10 watts producing 800 lumens. In fact, the information would be printed on the package of the lights. Some may ask where can I find the lumens and watts information of a bulb. Higher the lumen, higher the output of the lights. Therefore, lumen of a light is like the horsepower of a sports car. It is the basic technical parameter to compare the brightness of a light source. For instance, a 40W LED having 5200 lm is brighter than 100W incandescent lights having 1000 lm. For example, the higher the lumen output of a bulb, the brighter the lights. Lumens refers to the brightness of a light source. But in fact, power (wattage) and brightness (lumen) of bulb are not directly related. You may think that higher the power, brighter the bulb. When we buy a light bulb, we may notice its power.
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