All the lights on that are red. The LEDs under the clear cover are red LEDs.

I will join the chorus, white on the back is a VERY bad idea. Go with one of the excellent $30 lights - Axiom Pulse 60, Cygolite Hotshot, etc. If you are going to go with a magicshine style front light, then get the Magicshine taillight - it's $30 with a Y adapter so it runs off your headlight battery, and will beat anything else on the market for that money