Right now I have a 10g hood with lights but its old, the kind with the screw in light bulbs. The light it gives off is the ugly yellowish one, not the pristine white light my 29g new hood gives off. I want the light to be more like the other one. Is there a bulb or something I can buy to replace the bulbs I have now? Or am I stuck with the regular light bulbs and there yellowish light. Its 15 watt bulbs. The tube kind, not the spherical kind.