I was at a LFS today and saw a planted tank under a 4 bulb reef bulb set up (2x 10000k and 2 x 460nm) and the plants looked awesome. The neons in the tank did not show a red stripe at all lol I asked them if they were some kind of new tetra and the guy looked at me like I was a moron. This was a display tank and the plants had been grown out in the tank. They all looked extremely green and suprisingly the red ludwidgia looked amazing.
This got me thinking about another group of people who grow plants as a hobby, and they all use blue light for vegetative growth and red for flowering. Why would aquarium plants be any different? They might not be subjected to loads of blue light in the wild but so what? Unless aquatic plants function in a fundamentally different way than emersed plants they should respond to blue light with strong compact vegetative growth right?
Im not saying I'm going to start running all ati blue + bulbs over the planted tank, but am going to add atleast one blue bulb in the new fixture, maybe two. With the 36 1w 6,700k leds I have plenty of room to experiment with the t5's. The three t5's will be some combination of blue and red bulbs. Maybe two aquafloras and a single lagoon blue (17,000k) or 15,000k aquablue. With the 8 dimmable royal blue leds running over the tank I think I can use the 17,000k t5 to good effect. The bulb was designed for reefers who want a super high flourescent blue look to their tank and is meant to be used as a substitute for traditional daylight bulbs like 10,000k and 12,000k. Since it still has peaks across the spectrum it will still produce alot of output in the traditional planted tank wavelengths, but the overall color of the bulb is turquoise. My hope is that this bulb will make greens, blues, and reds pop in combination with the other bulbs.
Ill take some pics of the different bulb combinations... it should be an interesting study since all the different t5 combos will be against the backdrop of good amount of traditional 6,700k.