Is this any good? What is the major difference here with T5 lighting besides the width of the tube, presumably T5s give more output/lumens? I see some of the larger DIY chains B&Q etc are selling complete T4 units quite cheaply now, 20W light 6400K inc all fittings built in ballast etc and they are only â‚¬20 or about Â£15 each, these are primarily for under counter kitchen lighting and will not be waterproof but I am sure they could be modified. It just seems cheap compared to the equivalent T5 and they have to be better than T8s? Anybody use these?