The calculation that 15W LED tube light T8 replace 40W fluorescent
We already know that:
1, ordinary fluorescent tubes emit the light in all directions， wasting nearly 50% of luminous flux, while the LED tube light emit light at 120 degree light, only 60% of the the fluorescent lamps using the Lamp panel actually to reflect effect is valid, the rest are wastage.
2, there is theoretically no light decay in three years for the LED tube light, there is mostly up to 70% light decay in five years,, and light decay of the ordinary fluorescent reaches about 80% in three years, which is that 20% of the flux lost.
3, the actual wattage of 40 W is 36W fluorescent instead of the standard 40-watt, we collectively call that the 36W fluorescent lamp is 40W
4, the light efficiency of the fluorescent tube is generally 60 ~ 70Lm / W, but many lamps are actually not. Here we take the 80LM / W for example.
So we get the following conclusions:
LED 15W * 80LM / W = 1200LM (Luminous Flux)
LED 15W * 90LM / W = 1350LM (Luminous Flux)
LED 15W * 100LM / W = 1500LM (Luminous Flux)
Fluorescent 36W * 80LM / W = 2880LM 2880LM * 60% (light loss) = 1728LM 1728LM * 80% (lumen) = 1382LM (actual flux)
the overall brightness of 36W fluorescent lamp is actually 1382LM
Several formulas can be seen from the above, what is completely satisfied that 15W LED tube instead of T8 40W ordinary fluorescent lamp, let alone LED tube light that is of 100LM / W high light efficiency.
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