>>23213297You really have to be aware of the risks associated with all of them. Red provides the kick, but coupled with inadequate cooling you might have an explosion brewing. Use blue leds incrementally to control the reaction, but try not to let them mix into purple too much as that can cause weird electromagnetic disturbances. Greens are generally pretty safe to use, but if you use too many too close together, your components might start to decompose.
Mixing all three in an intelligent pattern would probably be best. Really, the way to find the best combination for your particular system is trial and error. But be careful.