They do make 30" T5's....I have one the bulbs on them are about 27". The only problem is that they are 2x18w T5 NO lights so they don't really have enough lighting for any corals really (Lucky I have another light on my tank) If you want strong enough lighting for your tank you are probably going to have to either go with a couple of those, a 24" setup, or a 36" setup. I don't know why they don't make better light sets for 29g tanks....its not like they are an uncommon size....To me a 24 or 36" tank is more uncommon