The UVL 660nm are grrreeeat lamps you guys. I don't know why anyone says they are a whitish color because they are definitely not whitish at all. They are very nice deep red color. Much redder than the Redsun lamps and quite a bit less orange. Right now I am running a 4 lamp T5 fixture with 2 Zoomed Ultra Sun white lamps and a Giesemann actinic plus and UVL 660nm in the middle. Lamp placement is Ultrasun, 660nm, actinic plus, Ultrasun and it's a bluish purple white overall color. I like what it's doing to the plants. They have been nice and perky and no strange looking growth. I was starting to see some crazy looking twisted, dark green, not normal looking growth on the Sour D's and Blueberry with the actinic plus/660nm 50/50 setup. Bulb order was actinic plus, 660nm, actinic plus, 660nm and although it was a super deep purple color I am willing to bet that there was to much 420nm light or blue overall causing the strange growth. As soon as I added the 2 Ultrasuns the growth went back to normal. I really prefer a full-spectrum type of light with an emphasis on deep blue and deep red since regular T5 full spec lamps do not have the deep blue and red in them. I would recommend this setup for veg most definitely.
For flowering I am thinking 2 Flora Suns(one on each side) and an actinic plus and 660nm in the middle. In other words, switch out the Ultra's for the Floras at flower time. Otherwise I may replace the actinic plus with a 75/25 since it has less blue.
Here is a shot of my fixture with my current veg setup. I had to ditch my plants because they got infested with thrips and other shit. So now I am starting over from cuttings. I will take new photos in a few weeks. Current lamp setup, ultra sun, actinic plus, 660nm, ultra sun T5 HO 4' lamp.