Orchid Lighting Upgrade: From Weak HPS to Effective Fluorescents

400 foot-candles at leaf level is far too low for 150 orchids. Target: 1,500 fc. Your 430W HPS runs too hot and too short.

Better Setup

• Two 4-ft shop lights with 40W cool-white fluorescent tubes (4 tubes total).
• Hang 12–24" above plants. Run 13 hours/day (increase with natural daylength).
• Add small fan for heat dissipation.
• Cost: ~$40. Covers 8 sq ft at 1,500+ fc.

Why Fluorescents Win

Cool, efficient, safe close to leaves. "Grow tubes" unnecessary—cool white works. Clip-on compact fluorescents are cheaper but cover less area.

Temperature Bonus

Lights add warmth—target 55–80°F. Humidity 40–80% is fine.