Sorry to resurrect an old thread, but . . . . There are several mentions of using an LED in the Beseler 23CII enlarger. I'm having a hard time finding them. The Beseler uses a BA15S bayonet bulb. The only BA15S bulbs that I can find are low voltage (12v) bulbs. The only high voltage (115V) are BA15D bayonet bulbs. Does anyone know where I can 115V BA15S bayonet mount bulbs? Thanks.