Lumes an OTF ,what is the difference ?

[bassdawg]

I really dont understand how come the light is rated at 500 lumes but 375 OTF ? Could you please explaine how come ?
Thanks ,
Bill

 

[Shooter21]

the 500 lumen rating is at the led so by the time the light exits the glass lens a lot of the output is lost. This is a clever trick most companies use to sell more flashlights they state the emitter lumens rather than the total out the front lumen output.

 

[phantom23]

500lm is maximum emitter brightness. But there's also series of losses before light will leave your flashlight. Good reflector can reflect about 80% of light. Yes, it wastes about 20% of light. Next - lens. Good lens waste another up to 5%.

 

[bassdawg]

Hey thanks to all now i understand .
Bill