Let me preface by saying this is probably unlikely, but I just had the idea and thought I'd throw it out there. A couple of years ago I bought the Dedolight 436 with DT36-1 ballast (www.bhphotovideo.com/c/product/231419-REG/Dedolight_K436_400W_One_Light_Kit.html) for a great price on ebay. It takes a 400w 36v halogen bulb and with the ballast packs a real punch basically the equivalent of a 1k. It's a tremendous light, but I find myself rarely using it though because of the size. I was considering selling it, until I thought that it might be possible to convert it to an HMI. Dedolight also makes an HMI (www.bhphotovideo.com/c/product/1090974-REG/dedolight_k400dt_s_hf_dlh400d_std_hmi_hf_blst_hard.html) of the same wattage that is part of the same series as this light, so it might be possible. Does anyone have any idea of how I would even go about contemplating to do this?