H600 MK* : LED + reflector + clear lens, spot + spill beam, good for general usage
H602/3: bare LED with no reflector, "mule", 100% flood, only suitable for close range. 2/3 as in MK2 and MK3.
"F" stands for frosted where a frosted lens replaces the stock clear lens to smooth out beam profile. Floodier than H600 and has more punch than the 602/3. Good all rounder without a defined hotspot.
"w": warm/neutral. In zebralight's definition, 4400-4500K CCT with 75 CRI but ~7% lower output. ZL lights are cool white by default, 6300K CCT with 70CRI.
"d": daylight tint. 5000K CCT with high CRI. Older generation like the H600Fd III have 83-85 CRI while newer ones like the SC600Fd III Plus have 93-95. Much better colour rendition.
"c": even warmer tint. 4000K CCT with high CRI. Older generation like the H600Fc III have 83-85 CRI while newer ones like the H53Fc have 93-95. Much better colour rendition.
Both the stock cool white and "w" neutral white come in a 5-step Macadam ellipse tint variation (unless otherwise specified, all info available in their spread sheet), "d" and "c" have a tint variation within a 2-step Macadam ellipse, meaning beam "colour" are much more consistent across samples and are closer to pure white in general.
H5*/H3*: battery type. 6 = 18650, 5 = AA and 3 = CR123A.