I got the K-109 3 mode version (CR123) and it wasn't very bright on primaries and it isn't programmable.
I later ordered the 3 mode version and it was the programmable version. It was about $10 vs. another version that was about $20.
The programmable version had a black o-ring in the head and an orange tail cap cover. The non-programmable version had a green tail cap cover and a GITD o-ring in the head.
Neither of the item descriptions mentioned programming. I had just heard that the more expensive light was programmable.
All of this attention may be of some enlightenment.
gcbryan notes that the programmable model has a red/orange tail switch and a black gasket at the front lens.
"SPOILER ALERT" - THIS IN NOT AN ENDORSEMENT!
[endorsement link deleted - DM51]
I'm not saying that I know anything. I just like to stir the pot sometimes. Based on this info, one day I will probably buy this just to find out.
I am a little pissed. I did want the programmable model. This one is just a $2.61 more, and the little
[language deleted] on me just 4 minutes into the 14500 lithium trial.
My only reservation is if this 6-mode, (with the orange tail switch) unit is the famed "user programmable" model, and will it use and LIVE while using a 14500 lithium battery.
That's pretty much the only way I'd use a single cell light, is if it will work with a 3.7v lithium. Working with a single AA would be great too. It would make this my favorite "gift" light.
Your thoughts?
p.s. I'm still interested in finding a 3-mode (H-M-L), 15mm driver, that would handle 4.2v - 4.5v, for modding these single cell lights.