These cheap
eBay lights are all very well until they go wrong. Then you've got the hassle of sending it back to China. I've just brought a 1000lumen cree light from the LBS. At £80 it wasn't cheap, but there is no facing around with cable ties or covering switches with bags to prevent water ingress. The high beam is about 4 hours, and low beam, which is still very bright is 18 hours.
I thought about buying a couple of eBay torches an making a battery pack up from
Maplin, but to be honest , by the time I added up the cost of putting it all together, it wasn't far off the cost of the one23 light.
Just my humble opinion.