You could simply retrofit the existing light with a chip-on-board (COB) module that has all the electronics built in so it runs on 110V AC. You do need to add a heat sink behind the module or mount it on the metal case for heat dissipation. I bought a couple of these just for experimenting. They are very bright for such a small module. Output is 120 lumen per watt for cool white, 90 lumens per watt for warm white. Be sure to use heat transfer grease between the module and the heat sink.
30W is $1.49 postpaid from China 50W is $1.69 postpaid from China
Same unit from US seller is 30W - $6.59 50W $6.79 postpaid https://www.ebay.com/itm/20W-30W-50W-110V-Smart-LED-Chip-Lamp-Flood-Light-COB-LED-Bulb-Warm-Cold-White/383331244745?hash=item5940529ac9:m:mBGh0hZpNvKXloDGpyGK0IA