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Old ,
aqualab aqualab is offline
Join Date: Oct 2008
Location: Chertsey, north of Montreal
Posts: 39
Default Re: where can I get bulbs?

Dave if I get you well , you want use your existing fixture and put higher tube in it , if so here the bad news :

when you put a higher wattage tube, you need to make sure the ballast will support it, I may be wrong but I never see a 18 40 watts tube, what you need is go with more expensive tube like VHO, with the expensive ballast than go with it , or add more tube, again resulting in changing the ballast. You have also the compact tube fixture. But even the smallest one will give you 65 W

But all those solution will cost a lot of $$$$$.