3x21A - medium sized smooth reflector options, either single (SBT90.2) or triple (SST40, SFT40, GT) emitter setup. No handle included. Set up as a medium range thrower. 3x21B - medium sized orange peel reflector with triple Cree emitters. No handle included. Set up as a high output medium range flooder. 3x21C - small orange peel reflector with 7 emitters (SST40 or SFT40). Handle included. Not entirely sure what the use case for this one is. I would expect a pretty floody beam pattern. 3x21D - large smooth reflector with SBT90.2 emitter. Handle included. This is a long range thrower. 3x21E - small TIR optics with 12 519A emitters. Handle included. Basically just 3 D4Ks taped together. Use case varies depending on the angle of the optics. I'd say most people would want something like this set up for short range flood of high CRI light with the 30 or 60 degree beaded optic. My personal recommendations would be the 3x21B for the use case you described in the other comment. Answer from Magnezone13 on reddit.com