Curious how they compare as I really like the beam of my two 504b:s and the ZL SC600 is a bit expensive especially after I bought a ZL H600 last month... :-)
Depend on the driver , reflector , LED bin...
If driver...
504B = about 3A
SC600 = IMO 1.5A-2.0A Hi , 2.0-2.5A turbo for 5 mins
UF-T50 = 2.2A
reflector
504B = I have difference reflector depend on drop-in inside.
LED
504B = IMO XM-L T5
SC600 = XM-L T6
UF-T50 = not sure
I use to test many XM-L drop-in , There are difference beam profile.
I have UF-T50 too, but still waiting for two flashlight with 1x26650.
If I received, I will take some comparison beamshots 