The Osram 64458 can be run at 21.0V. But it is very close to the instaflash point of about 21.5V. And that is with Lux Luthor's manual voltage adjustment method. So you'd need a soft start if you really plan to run at 21.0V delivered to the lamp.
Another issue is the heat generation from these bulbs. Even using ceramic fiber insulation on top of a Kiu socket/base can do only so much. I think you risk melting a plastic Mag switch body unless you have some sort of overtemp sensor that can throttle back the light.
The current draw is yet another problem to deal with. At over 10A draw, the Mag switch isn't going to be happy dealing with that amount of current.
AW's soft start D Mag switch might work, although the ~215W bulb draw is going to stress the switch. Plus, the D Mag switch is sold out.
The JimmyM D Mag regulator is another approach, but it too is sold out. A Version 2 hopefully will be available eventually.
AlanB's complete, regulated D Mag switch is available, but you have to get in a long line with what appears to be a long wait.
. It draws enough current to pull the Elite's down fast enough to keep it from flashing. As for the heat, it is a heat producing monster! I never go much over 30 second bursts with it, when the body starts getting warm it time to cut it off for a few minutes. I use the rocker switch mod in it, works great and can handle all the current you can throw at it.
