Splunk_Au
Enlightened
A runtime graph shows only about 1.5 regulated output for 125 lumens?
Isn't this quite bad, seems like Luxeon level of performance to me.
Isn't this quite bad, seems like Luxeon level of performance to me.
Um in case you haven't been around in the past few months, Chinese lights now have very close to rated out front lumen.in comparison the surefire LED lights with 120 lumens are as bright or even brighter than lots of lights rated at 200 lumens and more.
It's like the hp thing with cars. Stating the engine hp is note comparable to stating the hp which actually reach the road, after including transmission loss etc..
Um in case you haven't been around in the past few months, Chinese lights now have very close to rated out front lumen.
I don't like the look of this. Fenix T1 has 220 OTF lumens and regulated for 1.4 hours, this better have way more than 125 OTF lumens if it only regulates for 1.5 hours...
http://cpf.carrot.googlepages.com/flashlight_guide#lumenscarrot said:Lumens, on the other hand, has its own problems. Lumen ratings across manufacturers can vary wildly across brands. Many manufacturers give a rating for emitter output, which is highly optimistic because you can factor in about 30% light loss due to the reflector and window. Others make up wild claims and numbers just to look good. Precious few, give accurate lumen ratings. HDS/Ra is known to give exact lumen ratings. Surefire is known to underrate their lights.
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In order to get a lumen rating for a light a special tool called an integrating sphere is needed. It is expensive and a precision instrument. But if you wanted to to subjectively compare the total output of one light versus another a good way is to go into a small, enclosed space with little to no light, such as a bathroom, and perform a "ceiling bounce test," which consists of pointing an activated flashlight at the ceiling and measuring (with your eyes) how brightly lit one of the walls are, repeating for each flashlight to be compared.
http://cpf.carrot.googlepages.com/flashlight_guide#lumens
I strongly recommend against comparing flashlights by the spec sheets provided by manufacturers.