Hi Kole,

QTP 4x54T5HO/UNV PSN HTW NL is obsolete. The replacement MPN is QHE4X54T5HOUNVPSNHTSCLDOE. Replaces QTP 4X54T5/HO/UNV/PSN/HTW/NL [49161] which is 
discontinued.  
Description: High efficiency 4 lamp ballast Program Start UNV 
voltage with leads in a 10 pack that runs 4 or 3 54 W lamps, DOE 
compliant. 

Please Let me know if this replacement works. Thanks!!