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hps is ideal for flowering but not required.. u CAN flower with cfls but just know that the buds will be smaller and not as dense/tight, it will take longer to bud and you just wont yield as much.. the hps spectrum is ideal for flowering but the plant mainly just uses the energy from the light to flower so the real difference is the photon flux / energy (lumens).. there are things you can do to offset this though, drop the cfls as low as you can to the top of the plants without harming them and prune, prune away the leaves/branches that exist at the bottom/middle of the plant.. the cfl lumens will not reach those bottom nodes so those sites are just a waste of energy... top off the main stem in order to get two bud sites and lastly, try to use reflective material like mylar to bounce around and use all of the light (dont let precious lumens escape without getting absorbed by the plant). good luck
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