The Leddite Luma is a DX Bike light. Fact. If you look at the review it says you can buy the light for $80 from the Far East, (Deal Extreme), all you need for the DX light is a plug adaptor costing about a quid. Buy the DX from source and save £100. The AirBike light from On-One uses the same SSC P7 emitter, but is much more 'floody'. This I know as I have both lights. The AirBike is perhaps a bit better made, but the DX is just as good, and a lot cheaper. You can also get P7 torches from DX which produce the same 700 (not 900) lumens as the Exposure lights, just not as stylish, and will cost about $40, around £20, plus another tenner for a couple of 18560 batteries and a charger. You'll save yourselves around £200. Yes, I've got a DX Aurora SSC P7 torch, which is incredibly bright, with a tighter spot than the DX.