For a screen that small I would use CFL floodlights. The reflectors are way too big, you need the light signature to be more or less restricted to the screen or else it won't work that well.
I've had them for around 8 months now or longer. Even still at $1.78 that still isn't bad. I have 10 red and 4 warm white and the growth I get is amazing. Earlier back in this thread I posted pics of my growth. The fixture cost me around 35 to do.
Thanks Floyd. I'll write up a list when I get home