Quote Originally Posted by seventhchild
using the "Rauber's Substitution Method" would it be best to add the ican blacklight to the clear incans to balance the 660 and 730 or is there a preferred ratio ???
I'd say No.

Luckily Red Inc.'s alone and Clear Inc.'s alone provide a good ballance that is just a bit on the shady side of a Direct Sunlight spectrum, which is quite good for pigment synthesis, but it shifts to less desirable shady as is travels down paste the first layer of leaves.

Adding more Blacklight Inc.s (BLB's ~ Blacklight Blues) to the mix makes things shadier.

Adding Clear or Red Inc.'s to CFL's at a ratio of 1/3rd Watt Inc. per watt of CLF used, gives a more Redder than Direct Sunlight spectrum, which is actually better in my experience in general.

Preferred ratios, reveal the problem of personal preference on that one, but I prefer the Redder than Sunlight spectrums for Indoor light intensities compared to outdoor Direct Sunlight intensities.