Sunlite 150-Watt ED17 High Pressure Sodium 15000 Lumens Medium Base E26 Clear HID Light Bulb (2-Pack) HD02493-2 - The Home Depot
GE Lucalox High Pressure Sodium Light Bulb, ED18 HPS Bulb, 250-Watt, 28000 Lumen, Medium Base, White, 1-Pack, High Intensity Discharge, HID HPS Bulb for Use Only With S50 Ballast - Walmart.com
Amazon.com: iPower GLBULBH400 400W Pressure Sodium Grow Light Bulb Lamp for Plants High PAR Enhanced Red and Orange Spectrums CCT 2100K, HPS New : Everything Else
SYLVANIA 150-Watt E17 For Indoor or Enclosed Outdoor Use Only High-pressure Sodium HID Light Bulb at Lowes.com