For me personally, a good choice, the lamp is quite bright subjectively by the Cree LED and comes with a cell. In this model both expensive lithium cells with 3.6V (type 14500) can be used as well as ordinary AA-size batteries / accumulators with 1.5V or 1.2V.
I immediately noticed that the light different light with two same types of batteries from different manufacturers is lit, ie a "cheap" 1.5V AA cell from discounters around the corner brings much less light than the cell used ultimately by me of a brand manufacturer (with the drumming Hoppel Plush Bunny in advertising ...). That made me curious and I have a few cables and my multimeter hervorgekramt:
-> Discounter cell: Cancels of 1.55V at idle to 1,07V at a 1,23A, ie 1,32W be drawn from the lamp.
-> Brand Cell: Cancels of 1.62V at idle to 1,26V at a 1,64A, ie 2,07W be consumed by the lamp.
The internal resistance of brand cell appears to be significantly lower, making high current capable.
Ok, that explains before the difference in brightness.
That made me tempted to further measurements with an adjustable DC power supply, and I have taken the following course times (first column voltage across the lamp in volts, the second current in amperes, third the resulting power consumption in watts):
U / VI / AP / W
0.4 0.03 0.01
0.5 0.08 0.04
0.6 0.32 0.19
0.75 0.64 0.48
0.9 0.90 0.81
1.2 1.60 1.92
1.4 1.55 2.17
1.5 1.44 2.16
1.6 1.19 1.90
1.8 0.94 1.69
2.0 0.81 1.62
2.2 0.70 1.54
2.4 0.62 1.49
2.6 0.56 1.46
2.8 0.51 1.43
3.0 0.48 1.44
3.2 0.44 1.41
3.4 0.52 1.77
3.6 0.72 2.59
3.8 0.97 3.69
At about 0,5-0,6V the light begins to glow faintly, has about 1.5V, a maximum of well-2W, then remains relatively constant over a voltage range to about 3.4V and 3.5V turns off to the right. Here the lamp is damn bright and warms up considerably. Further than 3.8V I did not dare, I wanted to destroy the beautiful Cree course not.
Probably a simple step-up regulator is installed, which ensures the relatively extensive constancy of performance.
My Conclusion:
Where did the name come 5W I have no idea, even with 3.8V (lithium cell provides about 3.7V) draws only about 3,7W, thereby probably hardly arise 5W light output (perpetual motion 1. Art would no longer safe fit into the case). Nevertheless, I feel it to be quite bright.
The beam can be varied quite widely through the sliding ring with the lens. In max. Focus is the chip area of the Cree displayed :-) at max. Expansion, the beam at a distance of 1m a Diameter of 70cm. The lens ring can be unscrewed and completely, then is illuminated very flat. This brightened our study already amazingly good for such a small lamp.
Prima I find the usability of standard mignon AA 1.5V cells, however, one should pay attention to a sufficient high-current capability here, the same is true of course for batteries. You can easily figure out that a 2000mAh battery with 1.2 V at a current consumption of 2A no longer than one hour operation will give.
Although I find unusual robust for such processing a small and cheap flashlight, the deduction of a star in the mechanics of the switch justified. This is pennies fall to low, although one of the two lamps working quite well at the other of the switch at the rear end hooked unfortunately frequently when this does not express exactly in the middle ...
Long-term experience I have not collected yet both still work.
Hope this now quite extensively guessed review helps one or other purchase decision, I have other reviews certainly often enough influence and I am grateful for it. I read determines more than I write, but now times in detail ... ;-)
