I got myself an Olympus TG-1 because the underwater casing for my EOS 550D / Rebel T2i was forbiddingly expensive and I've already spent a big sum on new gear so now I'm looking at getting the PT-053 underwater casing for the TG-1 after which I'll need a tray, arms and lights. Are there any which are not too big and expensive that can function as a wrist strapped / hand held dive light plus provide enough light for the camera to get some decent photos at around 25 - 30 metres when mounted?