Ok here's the scoop...

For vegetative you want all your lights to be above 5000k. Preferably 6500k. The reason for this is this is the spectrum the plant really really wants during this stage. Red light is a waste of energy and will actually induce stretching.

For flowering you can keep all the lights on there you wish but the plant really wants red light and will use it the most to make the buds. However, having blue light here will still help the plant and will have no negative effects.

With this in mind I would spend the cash on red (warm white/2700k) 42w bulbs and SAVE them until flowering.

If you have cash now and will have some more cash when you start flowering then buy some 42w 6500k bulbs for veg, then buy some 2700k bulbs when you start flowering. Then you can replace your 26w 6500k bulbs with the 42w 6500k bulbs, as well as having the new 2700k 42w bulbs.

Did this make sense?

P.S. Halogen is BAAD for growing

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