This isn't particularly scientific but I compared the brightness of my sc51w (172 lumens claimed), against a sc51 (200 lumens claimed), a fenix LD25 R4 neutral white (180 ansi lumens claimed), a Quark AA2 R4 neutral white (190 lumens claimed), a H502c (140 lumens claimed), and a Quark AA2 R5 turbo cool white (206 lumens claimed). I just used a digital SLR light meter so with 1/3rd stop increments its not a very fine measurement. I bounced the light off a matte white wall (trying to keep the beam about the same size on the wall by adjusting distance) and then metered an opposite wall 4 meters away.
Anyway ...
The SC51w with imedion is the baseline exposure, and the others are relative to that.
0 - SC51w imedion battery
0 - H502c eneloop
+0.33 - SC51w eneloop (with the occasional flicker up to +0.66 stops)
+0.66 - SC51 eneloop (note this is the cool version)
+1 - LD25
+1 - Quark AA2 nw
+1 - Quark AA2 turbo cw
Visually the ld25 and 4sevens lights were definitely brighter.
Are there any reviews by the same reviewer that have put the SC51 and/or SC51w up against a common fenix or 4sevens light for comparison?
Anyway ...
The SC51w with imedion is the baseline exposure, and the others are relative to that.
0 - SC51w imedion battery
0 - H502c eneloop
+0.33 - SC51w eneloop (with the occasional flicker up to +0.66 stops)
+0.66 - SC51 eneloop (note this is the cool version)
+1 - LD25
+1 - Quark AA2 nw
+1 - Quark AA2 turbo cw
Visually the ld25 and 4sevens lights were definitely brighter.
Are there any reviews by the same reviewer that have put the SC51 and/or SC51w up against a common fenix or 4sevens light for comparison?