Clone bulb questions for sex determination

I am trying to make 7 or 14 clones on top of a water heater in crawl space measuring about 3'x3'x4'= 36 cubic feet for the sole purpose of sex determination. I will place the clones in small dixie cups having starter cubes with a rooting gel directly on the warm water heater.

This is what the space looks like: https://imgur.com/a/cNDgher

There is a socket in the ceiling with a switch. I will install a cfl bulb in the socket and I will replace the existing wall swithc with a timer switch (that works with screw in CFL bulbs) for the 12/12 photo period. I will cover the walls and door with mylar.

My questions are in regards to the light bulb i need to purchase for this purpose. Considering it is only for sex determination, I would prefer something simple and cheap like a screw-in bulb. I am not interested in Metal Halide. I specify CFL because that's what the boards recommend for cloning. I will either buy from a hardware store like home depot/rona or amazon.ca.

1. What color temperature should the bulb be?
2. What should be the power of the bulb?
3. What screw in CFL bulb model/brand would you recommend for this purpose?
 
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