[quote=clemence]
It’s also one of the least efficient LED lights I’ve seen test data for. Maukka’s data indicate ~50 lumen/W for the copper, clicky switch version, and less than 30 lumens/W for the titanium, e-switch version.
That’s on high. The 219B Tool did better on medium at around 70 lumens/W, but the JetuE21A results you shared previously were something like 75 lm/W on high.
The Tool looks like a really nice form factor, but the driver seems to be lacking.