I have this old Surefire light that I upgraded with a Malkoff Device (which, by the by, is the absolutely coolest sounding name anyone has ever come up with for a light bulb! immediate +10 steampunk points ) mounted on my AR. Unfortunately, either my eyes have become worse, the nights darker, or technology has just progressed to the point where a maybe 500 lumen light doesn't really seem adequate on that particular firearm. If possible, I would prefer to keep the light and just re-upgrade the head, since that ought to be cheaper than buying a new WML (~$300 for either a Surefire or a Streamlight, possibly a bit less if I buy from abroad but the shipping, taxes and custom fees can really eat up the savings). But what reliable options exist for this, now in 2021? I'd prefer something on-par with new lights, so 1000+ lumens and preferably at least 11000+ candela. The more the merrier of course, as long as I can have a nice spill for situational awaress and use two CR123 batteries. (I'm not opposed to rechargeables, but I do insist on being able to switch to 123's on demand.)
What upgrade paths exist for legacy Surefire lights in 2021 outside US borders? Anything new since Malkoff created his Device?