JUst wire em up to a variable adaptor from maplin, thats what I've done in the past when using PC fans for non computer applications.

Switch it to 12V an hey presto.

DAy, You should read up on clones, with 2 plants and a 150watt bulb you may get some nice free weed, but it won't be enough to sustain you as a regular pain killer.

If you have 2 spaces, 1 for veg, one for flowering, the veg one can be pretty small, just1 plant eventually after a bit of selection.

You grow a few plants from seed, and take cuttings/clones, after theese have developed roots then flower them, you will know the sex of all the plants that had the cuttings taken from them that are still in your vegging room.

cut down any male clones and the plants they came from.

Pick the best growing females and take more cuttings, try get space for 4 plants if you can, and put 2 clones in the flowering room, then another 2 about 4 weeks later.

When you harvest the first 2, put 2 ready clones in and start flowering then.

You'll get a more steady supply and cloning saves LOADS of time germinating, and takes off the first few weeks of vegging.

Just keep your favourate plant in the vegging room and keep taking cuttings.

I probably havn't explained it well, but just read read read on the subject , You can only learn more and more.

Good luck