What LED emitter to replace?

[kikoy]

Hi, i want to ask your help guys regarding a 20mm star emitter. I've been out from the LED bike light for awhile due to busy schedule. I just want to upgrade my old bike light that has dual cree R2 emitter and i think is running 750ma. What would be a good 20mm star emitter to replace my old R2's. I've heard of the R5's but maybe there is something newer and brighter considering the driver can carry the load the same as the R2 emitter. I dont want to change the driver as it is i a nice housing already.

Please give me your advice so that i can upgrade my old emitters.

Thank you in advance!