Ok lol how old is the bulb in the 22 inch? Because you can do two things. It is really best for the adult veiled to get a 10.0 uvb. So you can continue to use the 22 in uvb if it is no older then 6 months and is a 5.0 bulb. If it is older then you will replace it with another 5.0 bulb. Or you can just get a daylight bulb for the old fixture for extra light. But you would need to get a 10.0 UVB bulb for the new fixture to replace the 5.0. LOL does that make sense? The new fixture with uvb you will want to run across the middle of the enclosure to disperse the light evenly.Basking bulb, 60 watt, Dual t5ho 22" with 5.0 uvb, and 6500k. That will be my set up as of next Monday. It will leave me with an extra t5ho 22" with the old uvb bulb. I am just wondering if I can use that single fixture for extra light, not uvb.