I bought a 4ft tank second hand and basically the hood is crap and made out of some cheep aluminium. The bracket to hold the light tube in place just doesn't and as there is only one bulb I find it doesn't illuminate the tank properly. I want to make one out of wood/Mdf but can't decide which lighting to use, bulbs or LED's ?. Any advice from experience or just general ideas would be great. Also would pva glue and water act as an efficient barrier to stop the wood rotting ?