Hi all, I have recently ordered a 54w arcadia t5 controller for my 120cm tank. After recieving the item I have since discovered that the lenghts of the T5 tubes are a little more limited than T8`s. Basically the 54w T5 tube (115cm) will not fit in my hood without more modification....which my other half does not want me to do! Basically I need to know whether I can use the smaller 34" 39WATT lamp on this unit or would the power just blow the tube?? Please help, Id exchange the unit but I got it mail order so would be a pain in the *!$ to swap over.