MH Bulbs???

[TheReefGeek]

To find out what kinds of bulbs you can run, check your ballasts.

There will be some numbers on it.

M59 is a 400W probe start.
M135 is a 400W pulse-start.

Pulse start ballasts have transformer, capacitor, and ignitor.
Probe starts only have a transformer and capacitor.

Then you have to match your new bulbs to the ballasts.