по ссылке в сабже есть парочка моих "ревью":

1) Bright enough for commuting but the light spot is awful – thin horizontal line. Bought pack of 6(!) as I needed some cheap cases for experiments on building my own 3Wt LEDs' based light system. I really don't mind performance of theese in stock configuration, what matters is that they are good enough and cheap cases :)

2) If you place two of them on handlebars and adjust under slight different angles, you'll get a really good lightspot. Great setup for the price! I've bought 11 of them already for myself and friends. Every time somebody sees them and knows how much did it cost they immediately want some too :)

В общем если пользовать без переделки, то надо брать 2 штуки и ставить их чуть под разными углами к горизонту. Работают от аккумов 2500мах порядка 5 часов. В академе таких фонарей переделанных уже довольно много – десятка полтора набирается, может уже и больше.