Hi New Guy do you mean how many of my "friends" backed out on a goup buy?
Lets just say I got 4 if not more of the Giesemann MegaChrome 250watt DE 20,000K bulbs
Mike I don't know if the XM bulbs will work on a Pfo ballst. Maybe you can ask around on the forum and find out.
Remeber these bulbs are all brand new and at 40% off on J&L prices (already the lowest price in Canada). Is like boxing day with out taxes
Here are the links to the prices for these bubls at J&L:
http://www.jlaquatics.com/phpstore/s..._start_item=14