I think the muzzle flash (size, intensity and duration) may depend on whether flash suppressant is used on the powder or not.
I belonged to an outdoor range that allowed 24/7 access and we did some low light (almost no light) comparison tests with reloads and we found several faster burning than W231/HP-38/Universal powders did not produce enough muzzle flash to be an issue (Bullseye, Clays, WST, Titegroup, W231/HP-38, Universal). Muzzle flashes were more visible as small reddish to orange flashes viewed from the side but to the shooters, it was not bright enough or long enough flash to diminish the constriction of pupils to blind the shooters. If we could make out the targets/stands, we were able to engage the targets and point shoot as sights were difficult to see.
I volunteered at an indoor range where our defensive shooting instructor also taught local PD/SD/SWAT members and he arranged low light shooting stages for some of us to do point shooting exercises with factory ammunition and FMJ/JHP muzzle flashes were comparable or bit larger than reloads we tested. The objective of the low light shooting exercise was to duplicate night defensive shooting situations and we focused on the targets and not on our sights to perform point shooting (even though we had night sights installed).
Although I have not done any low light shooting with AutoComp, many claim that it is WSF with flash suppressant.