Dont just buy the 2 of the spectrums as plants dont just like the main spectrums to as a mix is the best lol
LIKE a hps bulb isnt just REDS ...its got blue ,green ,pruple , just more of reds like this but even more

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newer bulbs have alot more blues some have more green ...but as known reds are the main

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PURple Purple is perfect for all stages of plant growth, germination, root development, tuber and bulb formation and gives lots of internodal growth, and budsites. Great for orchids, cacti, ethnobotanicals, coral, sea plants etc. A small amount of NEAR UV ensures good production of essential oils - Great for Basil and other aromatic herbs.
BLUE. stimulates chlorophyll production more than any other colour, encouraging thick leaves, strong stems and compact vegatitive and leafy growth, keeps internodes close. Great for seedlings and cuttings. Perfect for plants cropped before flowering stage, such as lettuce and cress. With only blue light your plants stay short, and maturity takes much longer
RED encouages maturation of fruit and flowers towards the end of growth cycle. Use exclusively for the finishing period to maximise your fruit or flower yields. Perfect for flowers, peppers, and tomatoes. Too much red and no blue early on will S...t......r....e.......t.....c....h... your plants and increase internode distance.

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I have been using one 27w.cfl/6500k for my seedling(2 days old) I also have a 23w.cfl/5500k which I haven't used yet. Should I use them both together or just the 6500k? When should I stop using the 6500k?

use them both the more spectrums the better

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I also have a 23w.cfl/3500k, isn't it a little early to add that light as well? Thanx for the help!

You dont want to use one spectrum for each part E.G ( blue/vegging/red/flowering)
Even the sun has many different spectrums.! use all that you have ...as different spectrums help different things

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