Now now Ian its that kind of sarcasm that gives us newbies the wrong idea. It wasn't until I was far too tight to spend £15 on one tube and grew all my plants under £3 silvania 3000k tubes that I truly believed that.
Tom that is some major lighting you have going on there. Is this purely in favour of getting a darker red or more for a nicer viewing colour?
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There's a few things happening:
1. Reflective color- Obviously, a red bulb will give off and reflect more red light colour than say blue or a white.
2. Intensity. I can vary this over a rather infinite range as far as hobbyists might even encounter. I use high light to grow the Farm faster. That's about it, not for color so much.
3. The bulb config certainly seems to be doing something. Can I prove it? No, can I show a lot of correlation? Yes, can I find any other real differences otherwise? No, and I've tried a few things.
My 180 has 2 of the same ATI fixtires, so I can add different bulbs to one side vs the other, get the PAr identical, add the same red plants to each side, then see what the colours look like after say 4-8 weeks against a white background out of the water in sunlight at noon.
This would show it's the lighting alone, so light test can be done.
A fairly simple test actually most hobbyists could do.
There's an edit in the above bulb list:
2 of the bulbs should be the Zoomed flora's
1 Giesemann Aquaflora, then a 2 Zoomed Flora, then a 3 Sunwave Wavepoint, then a 4 Red Wave Wavepoint, then an 5 URI Red Sun, then a 6 Sunwave Wavepoint, then 7 Zoomed Flora and lastly a 8 Giesemann aquaflora.
This seesm to do very well.
I suppose if you cannot get the Red or Sun Wave/Wavepoint brands, sub another Zoomed Flora(similar to the Red) and the ultra Sun(similar to the Sunwave).
The Zoomed bulbs are German made and quite cheap in price.