Newer units vibrate less so less noise. You can try to find the noise most of the time it's just a loose part. Old bike tubes make good rubber insulators for some parts to quit down a transformer. Just use common since and you can figure it out.

Just check and make sure the voltage match and the bulb type match. HPS light need igniters (an extra charge of electricity) to get then going. MH does not need igniters.