Sorry dont really know how to upload pics onto the forum. Just mean like the light comes out brighter on the one half than the other on the bulb. I have the brighter half facing the water n the dull half facing the reflector on the lid. Make sense? 

Cheers mate, yeah I have it the right way round n i do have a reflector, spoke to a guy at the lfs too!!I know what you mean mate, they make some tubes with half the tube painted. You have it the right way round as in brighter side facing the water. The painted side still lets light out into the hood so an additional reflector would be good too.
Not sure if you've already got one though.