So I'm looking for a 4 foot long fixture for my racks. I think I've settled on sunblaze but wanted to know what the deal was with the blue light. Its in the 6500 range which is perfect but can I get 6500 in white light? Does the blue light give any advantages? Also do you think the 4 bulb fixture would be ok for a rack of verts. It may be a bit bright but would allow for good penetration. Ideas?