I just bought a used 23CII XL condenser enlarger and was trying to determine what bulb it takes. From my research it seems that some use a 111a and some a 140 bulb. If I'm not mistaken the heads that have the bulb coming out from the back of the enlarger and are parallel to the negative use the 111a. I just wanted to make sure this was correct before I purchased several of them at $8 a pop. I ordered a manual for it wont be here for a few days and I wanted to try and track down a bulb so I could use it for the weekend. Thanks.