Thats a negative of PC lighting (I assume that was the Dulux bulbs are) and T-8 in some areas. I had to order a case of T-8s from bulbs.com for 84.00 after shipping. Still cheap for 25 bulbs, but still expensive up front. As for the bulbs themselves (TL 850) they are 5000K 86CRI and burn blueish to white. I am 2X ODNOing them and my plants exploded with growth with 4 of them over my tank. I mean my crypts alone doubled in size and have already started shooting out tons of new plants.