Need HELP with hps CONVERSION bulb??

I have a Mercury bulb 150 watt that runs on a ballast. The ballast looks like this / \ and shines the light through the bottom with a cable coming out the top.
I was wondering if this bulb would fit on it or how i would know if it would fit.

http://www.google.com/products/catalog?q=hps+conversion+bulb&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&cid=10961156932567887017&sa=X&ei=vfqpTcPeLejX0QHI4IDRDw&ved=0CEsQ8wIwAg#

I am going to buy this conversion bulb so i can get the right light that the hps light puts off so i can get more from my grow instead of just using fluorescent.

Thanks i really need a hps soon so please help!!
 
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