Amazon.com: YOOLUX 400W HPS Bulb (HIGH Pressure Sodium) for Indoor Plant,High PAR Promote Red and Orange Spectrums Flower Bulbs CCT 2100K, Supper Bright 56,000 Lumens. Grow Light Bulb Lamp(1-Pack) : Patio, Lawn
400w Watt Hps Grow Light Bulb Flowering High Pressure Sodium Lamp - 48000 Lumens - Tool Parts - AliExpress
Amazon.com: Vegelumax 2-Pack 400W HPS Super Grow Light Bulb,High PAR Enhanced Red and Orange Spectrum for Horticulture Plant Growth Flourishing,CCT 2100K,Ultra Bright 55,000Lumens,E39 Base : Everything Else
GE Lighting 93122140 LED200ED37/740 DLC Listed 200 Watts LED HID Type B Lamp EX39 Base 277-480V 4000K Replaces 400W HPS or 400W MH
GE 400-Watt Ed18 For Indoor/Outdoor Use High-pressure Sodium HID Light Bulb in the HID Light Bulbs department at Lowes.com