I’ve been eyeing up the Acebeam E75 and noticed a difference in lumen output: the Cool White version is rated at 4,500 lumens, while the Neutral White version only reaches 3,000 lumens.
I’ve seen this same pattern with other lights on Amazon as well. Is there a reason why?
by WIInvestigator
3 Comments
Colder temps produce more output than warmer temps.
For instance, a 4500k led will not be as bright as a 6500k in the same torch
The E75 can come with a variety of LEDs, check which LED is in which offering. I’d assume Nichia 519A in the “neutral” 5000K one and TN3535 or similar in the 6700K one. One is R9080, the other R70.
High CRI causes a huge drop in efficacy, so less lm/W.
Warmer CCTs are less efficient, too, but modern LEDs have barely any difference between 4000K and 6700K.
Lower CCT or higher CRI phosphor layer has lower efficiency
4500lm with 6500K CRI70(secret emitter) and 3000lm with 5000K CRI9050 LED(519a)