Beyond being as bright as possible, do you care about anything else? Does this saber include the use of a soundboard? Do you want it to have effects? Or will it just be a battery pack pumping power into red LEDs?
You are probably going to want an enhanced red blade. The red LEDs won't interact with it, but it will catch and diffuse the light to squeeze out every last bit, and it will catch and convert the intense blue light at cons and out doors.