I bought one from deal extream for about a tenner the year before last(bought 4 in fact). They were as bright as the £10 tesco torch and with a bit of bodgeing (the central tube was removable, drill hole in remainng caseing, solder wires in etc) I wired them up to run with remote batteries. Think theyre still there for about £6.
The £4 3xAAA from China one is actualy slightly brighter though, maybe looking at the tesco torches with rose tinted glases? The Tesco ones had a Q5 LED which has a theoretical 240lumens, my £4 one looks more like 300?
Or maybe a P7 torch, plenty of those on there as well.
Vapextech are good for high capacity re-chargables, the really high capacity ones do lose lot of charge if left unused though so best for chargeing up on the day. Saying that, they’ve been in my SLR for ages
with continuous auto focusing and live preview.