HPS (orange/red spectrum) is usable for winter supplementation but lacks blue light for leafy growth.
We use HPS in Pacific Northwest winters to boost limited sun.
Optimal Fluorescent Light Duration for African Violets
Choosing the Right Compact Fluorescent Bulb for Carnivorous Plants
Maximizing Color in Pinguicula: Light Intensity Solutions
High-Output Fluorescent Light Distance: Match Distance to Lumen Output
Artificial Light for Plants: Fluorescent vs. Incandescent
African Violet Pale Leaves & No Blooms: Light, Fertilizer & Epsom Salts
Choosing the Best Grow Lights: Fluorescent vs. HID for Indoor Gardening
Choosing Compact Grow Lights for Nepenthes: T5 vs. T12 vs. CFL
Evaluating 4-Foot Shop Lights for Indoor Carnivorous Plant Growing
Fluorescent Grow Lights: Distance, Duration, and Plant Selection
Grow Lights: Artificial Sun for Indoor Gardens
Indoor Grow Lights: Artificial Lighting for Healthy Plants
Specialty of LED Grow Lights: Energy Efficiency and Plant Performance
HPS Grow Lights: The Indoor Gardener's Guide to High-Pressure Sodium
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