Why no one light set up works for all
Phaeton said "sativa wants almost 20% more blue than the indica." We can pretty well extrapolate that as ^^^^ 411, BUT, what about crosses? I say play to the strain that is dominant. BUT, I am growing my first (F1 X) between S/I and will begin to select the Indica dom from them to clone. THEN I can hone in on which combination of spectrums works best. However, I have seen signs already as the pinkish side plants have larger leaf sets
Another hot tip is that the blue spectrum is only utilized by ~ 8-10%. So if your grow bulbs have a decent % blue, adding a Special Blue Actinic (I was) is wasting a slot needed for 550-700, but if/when you are in flower, using ~ 80% 600-740, then adding a SBA would be essential.
Bear in mind I am using 6/8 bulb HO T5: One 3 bulb mix leaned to pink, the other with the SBA blue-pink. I noticed the plants under the pinker blend had bigger leaf sets! Good indicator that they are Indica dom. So today, beginning 3rd week veg, I replaced #2 (SBA) with a UVL AquaSun.
Spectral balance is now equal, leaning toward pink, as follows:
Veg
1 & 4. Quantum Grow (veg only)
2 & 6. UVL AquaSun (veg only)
3 & 5. Coral Wave (veg/flower)
This config distributes the spectrums evenly
* UVL says Red Lifes will be shipped out this Friday. They now have a few 660s for testing. I hope to wrangle 2.
For Flower I'm thinking
1 & 8 Quantum Flower or UVL AquaSun
2 & 7 660
3 & 5 Coral Waves
4 & 6 Red Lifes - 600-615