A Single Cree XM-L T6 is *NOT* capable of delivering that kind of light unless severely over driven. The usual case with this kind of lamp is that it is under driven. The driver supplying the LED should be giving about 3A to give the manufacturer rated 1K-ish Lumens, but the likelihood is that it's nearer to 2, rather than the 6.5A needed to give 1,600 Lumens (as current increases, efficiency decreases, and 6.5A is dodgy even in the short term of a few seconds unless extremely well heatsinked). The chances of a Driver in a cheap lamp supplying 3A, let alone 6A+ is pretty much sod all. The Manufacturers rating, depending on the "bin" of the LED, is about 1,000 Lumens.

In reality, most Chinese/HK vendors lie like crazy, knowing that 99% of buyers just know that it's bright as hell compared to a Maglite, and don't give a rats arse about anything I've just written about. A properly built light would use 2 slightly underdriven XM-L T6's to give a true, 1,600 Lumens Out The Front (OTF Lumens, or "real" lumen's).

I use 2 XM-L's, but in reality, I don't drive them hard enough to give a full output, and they probably give off something like 1300-1400 Lumens.

My eldest Son recently bought me a cheapo '1300' lumen version off Fleabay for about £12 with two batteries plus charger. Current is around 2.8 Amps on high but it had too many flashy modes (since rectified).

Cheap and nasty but impressive light output.

Ah, in that case I'll put up with the flashy modes for now. But thanks for the link.