I think I understand what the numbers mean now.
Correct me if I am wrong.
1.You want the highest C.R.T. rating you can get.
2.You want the highest Lumens you can get.
3. you want a Kelvin rating of at least 5000-5500k
4. have one or two of the bulbs that have a Kelvin rating of 6500K-7100k to even out the yellow/orange effect. Get them in the highest C.R.I. and Lumens rating. The way I understand it is that it is personal choice to add a Day or Cool light to even out the light to the human eye. (Thats all)
What is the best Kelvin rating for vfts and sundews? 5000-5500K or 6000-6500k? What name brand 4' T-8s have the highest C.R.I. and Lumens ratings? What is the best and best priced. Is it GE, Sylvania, or Phillips.