As an incurable flashoholic I have hard to resist some nice and interesting flashlight. Especially if it's discontinued and I find it at an outsale. Since earlier I have Zebralight 1AA red headlamp and recently I found an Olight M20 Crimson at lower price. It's the single mode version at 105lm. I received it today.
Impression: while 105lm is a moderate output for a "normal" tint, it's really bright considering the red tint. I compared it to Fenix TK15S2 with Fenix red filter. This red filter lowers the output to ~1/5. M20 Crimson is significantly brighter than Fenix TK15S2(400lm) with the red filter. The tint of M20 Crimson is deep red and makes the tint of the Fenix red filter looking towards orange.
Olight M20 Crimson has a beefy hotspot, like Surefire P2X Fury, which surprised me because the red emitter is very small.
Just for fun I attached the Fenix red filter to the M20 Crimson. I expected the output would be much lower, but not.
I hardly could see a difference! According to the lightmeter the brightness remained around 80% as without it. While attached to a cool white LED it dropped to around 20%(in both cases some of the light loss is because the filter cuts of a part of the spill).
I understand some of you here can explain the physical explanation to this "phenomenon".
However, I find this light to be interesting and will try it out more at the end of august(we have midnight sun here now).
The possibility to have a pretty bright flashlight with some throw and still not totally damaging the night vision is attractive.