Nice. I missed this topic at first, because it didn’t come up in the search so I started one in “keychain” sub forum.
The A28 looks interesting to me, although not keychain size. The A9 looks really nice. I just wish they had made a provision for a side emitter. I know it would’ve added cost to drill a hole in the metal casing… but that side light on the A5, A7, and A8 is so useful.
Bought these from Illumn.com. I saw some pics and the tint looked very rosy but in real life it is not. The DUV is the same typical 219C positive DUV (above BBL). I'm also not a fan of the double click to turn on but I understand that is to prevent accidental activation when in the pocket.
Measurements taken at 2s measured with the Texas Ace Lumen Tube calibrated with Maukka lights and Sekonic C-800-U