120V LED Light Power Supply
As @digitalninja mentions, this is a constant current led driver. Unlike a variable current/constant voltage power supply, that attempts to keep the same voltage output regardless of the current pulled, a constant current supply will attempt to keep the same current, by varying the voltage.

It will, given a load like an led bulb, change the voltage until the current becomes 350mA. That could be a 24V 350mA led bulb/strip, or a 12V 350mA led bulb/strip, or whatever.

As such, you are looking for bulb that states it is that current draw within that voltage range.