Redhatter

Actually, a LED is a diode, two layers of silicon: one deficient in electrons, the other with a surplus. A transistor has 3 layers: if you like it's two diodes glued back-to-back (i.e. deficient parts together, forming NPN or surplus parts together forming PNP).

(But we're now splitting hairs here. Yes, some might describe me as a "computer nerd", also an "electronics nerd".)

I think the OP was referring to the fact that the lumens light output seems to be racing ahead much like the number of transistors in ICs (i.e. Moore's law) and much like transistor density, eventually we're going to hit some brick wall where we reach a limit and have to use parallel LEDs to gain further brightness. (Like todays CPUs: going to multiple cores)

colleen c

I think DX is quoting the 1 amp spec as the driver current for each LED. If that is the case then each Led is drawing 1amp at the emitter. The Cree spec for 1 amp at the LED will yield 388 lumens. The light has 7 led and thus the total lumens should be about 2716 lumens. The claim 3000 lumens is close enough for me considering how wild some other company or seller will claim exponential lumens from their light.

I am guessing each LED with be consuming about at least 3 watts of power since the forward volt is at about 3v when the emitter is driven at 1 amp. The light might be consuming at least 21 watts of power. The claim on the runtime may be accurate depending on the size of the battery use. I see the 2-3 hrs runtime claim as possibly true only if the 1 amp claim is the spec for the drive current of each emitter and not actually the draw from the power pack.

Redhatter

Sounds feasible, in which case someone who wrote their specs up forgot about Kirchoff's Current Law, there are probably in a couple of strings of LEDs that are then parallelled. Maybe 3 pairs of LEDs then one lone one on its own PSU channel?

colleen c

Most likely the 7 led are in series. I have seen advertised drivers that can power 7 led in series by using a booster circuit. They claim a 23 volt output and with 7 led in series, that will put each one in the correct spec for the voltage. However what I am not sure of is the claim on these driver quoting to be 2 to 3 amps. That is much higher than what the Trustfire lumen claim if each LED is driven at those current. What I suspect is that they are clamping the Mode so that it will not go into High mode and just use the Mid mode. Either that or they have driver custom made for their light.

dougmc

I didn't say or even imply that it did. I also invoked the largely tongue-in-cheek suggestion that number of blades in a razor blade might follow a similar progression, to further suggest that it would be absurd.

All of that was really just a joke, one that I thought was quite obvious ... but the seven emitters in this ugly beast certainly is quite an oddity.