Was just thinking that the cooling would be more efficient if
the heat sink grooves you machined into the head piece would
be oriented lengthwise so the air, you were moving through ,would travel
down the valleys carrying the heat away. (90 deg to your existing design)
Probably not necessary even if the lamp was being driven way over max.
Was thinking of it mounted on a bike, the wind flow etc..
Single, built like a tank, and yep (for sale soon)! It barely got warm with a Solarforce drop in on high and the dropin itself was close to the same temp.
I'm thinking natural HA, but the shop here makes a nice purple and does other colors, too.