Replacing one means matching four things: the output type (constant current or constant voltage), the output current or voltage range, the input voltage range, and the dimming protocol. A 0-10V driver will not respond to a TRIAC dimmer, a 350 mA driver will overdrive a lamp designed for 250 mA, and a 120-277V driver installed on a 347V circuit fails immediately. Physical size matters too, because the driver has to fit the compartment it came out of.
We stock LED drivers in constant-current and constant-voltage versions, fluorescent ballasts for T8 and T5 systems, and HID ballasts for metal halide and high-pressure sodium fixtures. Output current, input range, dimming type and case dimensions are listed per item.