This is an LED conversion that used to be offered.
TerraLUX/Lightstar Corp. TLE-110S Ministar 110S Single Mode 600 Lumen LED Upgrade for Streamlight SL20x Flashlight. Get yours at Battery Junction today!
www.batteryjunction.com
One of the challenges is that LED conversions only work in the aluminum body lights and they tried to do it in the plastic version.
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I fell in love with that light as well (own a few ) , and had made progress on a drop in LED module offering.
The challenge with the LEDs and optics available at that time was that I could get very good color rending, more light (lumens ) but it was quite difficult to match the hot spot "throw" of that incan bulb / reflector combination.
From a price point perspective, it is actually difficult to build up an LED drop in module - made from very good quality parts - that is much less than buying new lights.
If I remember correctly, the LED that I was using had some specific characteristics that are not produced anymore either.
Unless you have 100s of them, it is probably cheaper to start over even if the drop in is available.
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Just saw that
@M@elstrom gave similar advice. ....