If you look at the nitecore p25, nitecore claims it will run on turbo for 1h45m (860 lumens on an old xml-u2) 860 lumens must be close to 2800mah per hour yet the battery tested is 2600mah? are they over stating it or is the power difference on the old xmls so close between 860 lumens and 550 lumens?
” For user safety and to prevent overheating / failure, the P25 will automatically switch to high mode after twenty minutes of use in Turbo mode. Press the switch partway and hold to reactivate turbo mode when needed. ”
So it’s no longer in turbo? Besides that they should show it on their advertisements not in the user manual. I think it’s false advertising but I’m open to correction
Consider that what nitecore is up against in terms of chineese competition’s claims of performance.
Then consider:
“NITECORE (a subbrand of Sysmax) is the 15th member of this organization and also the only Chinese company which is admitted to this organization. Its presence makes Chinese company finally have a role to play in the international market. NITECORE will avail itself of this opportunity to boost the development of the China’s portable illumination industry standardization with its best efforts.”
Marblehead, MA December 19, 2013 — The Portable Lights American Trade Organization (PLATO), a trade association, has been formed to advance the mutual interests of the portable lighting industry. A primary goal of PLATO is to educate the public about the first industry standard known as “ANSI/NEMA FL-1”, developed to measure flashlight performance. The National Electrical Manufacturers Association approved the ANSI/NEMA FL-1 standard as an American National Standard on August 18, 2009. Many companies in the portable lighting industry now utilize this standard. PLATO has recently updated its website for those seeking further information about ANSI/NEMA FL-1.
The ANSI/NEMA FL-1 standard specifies a methodology for testing, measuring, and rating the basic performance of flashlights, headlamps, spotlights, and portable lighting tools, giving consumers and purchasing managers a uniform system for understanding and comparing product performance.
I agree with Ronin42 BUT would also note that virtually everyone making or selling high output LED flashlights is doing exactly the same thing as Nitecore does as far as Turbo run time is concerned. The problem as I see it is that the ANSI/NEMA FL-1 standard has holes in it that you can drive a semi truck through. Throw being to 1/4 Lumen illumination level and Turbo output not being graphed as in post #1 as part of the normal specification listing for a light being two of them. Actually IMO any light with mode step down should graph the step down for ALL modes that it can happen in and specify if timed control or controlled by a temperature sensor. The third spec I do not care for is the run time being listed to 10% output for all modes. I would prefer being timed to 50% or 25% output as more real world.
Good for comparison purposes I guess but you have to remember the FL-1 standard was created by light MANUFACTURERS, not the customers. It was intended to eliminate the exaggerated advertising claims of light manufacturers at the time which were almost as bad as many current Chinese budget flashlight claims. No competing standard I know of unless there is a Mil Spec for modern flashlights no one has heard of.