My company installs a lot of lighting control systems and I was thinking that we have had problems dimming track mounted LED retrofit bulbs from time to time as they will flicker. A while back I realized that the track head is feeding (through a transformer) 12VAC to these MR16 bulbs and that the dimming quality was directly related to the bulb manufacturer/model#. I knew the rectifier circuitry had to be built into the bulb so I took one apart and sure enough there was a little circuit board.
Fast forward to my current Moped project and it occurred to me last week that those little circuit boards could be a down and dirty (and cheap) way to get a tiny little rectifier anywhere you want a 12V LED bulb. I have tested the output from the board and sure enough, 12VAC in (from a TrailTech regulator) and 12VDC out.
The MR16 bulb form factor is entirely wrong for the extremely limited space I have to work with so I'm not sure of the solution for what bulb to use yet. The 50watt equivalent MR16 draws 7 watts so I'll stay in that range.
I will post photos once I get further assuming the whole thing pans out. (edited)