They keep saying "300 lumens (MAX)". Basically, just before it blows up, it'll put out 300 lumens.

https://www.google.c...bv.52164340,d.b2I

If it's a Cree X-Lamp XE-R Q5 LED, then it's normally rated at 107 lumens at around 400 mA (or about 1.5W). In order to get 300 lumens, it would have to be driven at full power. If that is 7 watts at 3.7V, that is 1.9A. The battery would be drained very quickly.

Similarly with the 1000 lumen Cree flashlights - http://www.amazon.co...ght/dp/B005E48K6I for $7.37. It's a 10W LED.

http://www.cree.com/...ning/XLampXML.pdf

At 1 A drive current, the T6 version puts out 388 lumens; at 2 A drive current, it puts out 692 lumens. You've got to drive it very hard to get 1000 lumens from it. 10W/3.7V = 2.7A.

These things are extraordinarily bright, but they're not breaking records yet. There's a 4100 lumens (100 W) halogen flashlight out there for $200 that can set paper on fire... http://www.wickedlasers.com/torch

There is a claimed 3500 lumens LED thingy for around $300 - http://www.newegg.co...-_-9SIA1530T23465

Zooks...

But for < $10, those LED things at Amazon are very tempting... Maybe I'll get one on a lark.

Thanks.

Cheers,
Scott.