Where did you get the A8, and what is the A8? I think the A2 is the XM-L2 version, and the A5 is an XP-E version. Should have bought the A5 - cheaper and will be changing the LED anyway.
There’s rings, but very minimal. I looked at it in flood, and little to none artifacts outside the zone. In zoomed out focused, there’s a circle around the square LED, but again looks very uniform, but expected without a full blackout of the head.
For now, think I’d try a simple amp boost (two R500’s shown) by adding a resistor, and replace the LED with either a de-domed XP-L V6, or maybe the XP-E2 Torch, or a de-domed XP-G2. Hoping for a good 30K+ - would be nice.
I'm a fan of the ZeusRay's, but this A2 light is no comparison. The ZeusRay, if you actually get one like advertised, is a good deal for $8, but the A2 is equally as good a deal, or better, for $18. Can't compare the two - like comparing a Sipik SK68 to a Convoy in quality, plus all the better features with the A2 (LVP, USB charging...).
The more I look at it, the more I'm impressed with it - I agree with freeme in that it competes with much higher cost brand name lights - $17.42 now, here:dhgate.com-supfire-a2
It's not perfect by any means. It's too long - they could have been smarter to get it down in length, plus the modes I mentioned - not a big fan of this type of UI. But I do like it's compact pocket size in width, like other tube lights but in a zoomie.
Hope I get some time this eve to mod mine up... Might throw in a XP-L HI for now.
Ok - rigged it up on the bench and tried it. While on the charger, the RED LED in the switch blinks, and turning the main LED on works fine, and the RED LED still blinks. So it all appears to fully work while charging.
Well, it's still all in pieces, but will be modding it first. Just from my own opinion, it's a pretty nice clean beam for a zoomie. Full flood is smaller than some, but kind of expected for the small lens. it focuses perfectly, showing the dot patterns of the XM-L2 surface, with a ring pattern immediately around the dye image, but again, looks smooth. You really need to black out everything under the lens and around the LED to get rid of everything.