I've bought an EQJ trading overtank luminaire 4x24w unit about 18 months ago and a few months ago, one of the tube failed to work and then following that now the other tube failed to work. These 2 tubes is connected to the same ballast. Judging from the look of the first tube, the fault probably lies with the tube. I've talk to EQJ trading about this and they recommend the ballast was damaged. However, if the ballast was damaged, wouldn't the light unit work only on 2x24w rather 3x24w? He is willing to send me spare ballast for 25 quid to replace the "damaged" and I've never been any good with DIY stuff. I've open the unit up and i'm just able to make out how to dismantle the ballast unit with the lamp holder. I still can't figure out how to disconnect the lampholder from the ballast or the connection with the switch. Have anyone replaced the ballast of these unit before and would somebody kindly talk me through the procedure? EQJ trading staff have told me that ballast unit need soldering but as far as I can see, I couldn't work out the soldering part on the previous ballast fixture. If this is true then I guess I might just have to stick with 2x24w as I don't have a soldering kit.