G'day there, i just bought a new tank and it has one pl-11w/8000k lamp. I decided to upgrade it so i can have coral, so i went out and bought a bigger ballast (EC 36/40) so i can can install 2x18w lamps, and yeh i noticed on the ballast it labbeled all the lamps i could use:
1x36/40w T
2x...