What bulb for pulse strike ballast

It's time to replace my 400w mh bulbs. Right now I have 10000k bulbs and not sure of the brand, they came with the set up from aqua medic. I'm looking to go more blue somewhere in the 15000k range. but I'm not sure what bulb is designed for a pulse strike ballast. this is the ballast I have Oceanballast M 400 Mogul (M-135 Pulse Strike). Any advise is appreciated

Thanks Chris
 
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