That part # indicates that it is a HPS lamp. Here's a bit on info on low pressure sodiums for ya.........
EERE Consumer's Guide: Low-Pressure Sodium Lighting

Have a good grow!:jointsmile:
Psycho4Bud Reviewed by Psycho4Bud on . Philips 70 watt "High Pressure Sodium" Bulb? just saw these Philips high pressure sodium bulbs..they clame to be high pressure sodium...but they're only twenty dollars, and i read somewhere that these are actually "Low Pressure Sodium"..is that true? says its a "Philips 70 watt, C70S62/ALTO" and everywhere i look its labeled as a high pressure sodium bulb... So confused....:wtf: Rating: 5