Anyone know what bulb to use

hey i have a 150watt ballast i'm not sure if it can run MH or HPS as on the front it has MH on it but also has HPS in( ) so i'm not sure what bulb to use anyone have any ideas ill post a pic of the ballast. its a sealed unit i cant open it already tried, seems like its all filled with resin or something ??? i write whats on the top of ballast.

Its made by ATCO i tried contacting them - no reply

ATCO MH150TH254-10
240V 50Hz 0.9Amp CosO 0.9
Control gear with thermal cutout
for 150W MH(HPS) Lamp (100V,1.8A)

Any help is appreciated as i cannot get a answer from anywhere ? thought id ask cause someone on this site may be using this type of ballast.






Also MH 150 watt globes are avaliable as are 150W HPS so i dont know which to use or can i use either or ???

MH (HPS) means that ballast is designed to run either, but you'll need to add a starter (ignitor) to the ballast and capacitor, to fire HPS.

thanks heaps