Greenhouse Fluorescent Light Distance for Medium-Light Plants

For medium-light plants under fluorescent tubes (T5/T8):

Distance Guidelines

• Medium light: 12–18″ below tubes.
• Low light: 2–4 ft below tubes.
• High light: 4–6″ below tubes.

Modifying Factors

• Natural light supplement: Can increase distances.
• Tube type: T5 HO > T8 > T12 (intensity).
• Reflectors: Good fixtures with reflectors boost effective range.
• Duration: 14–16 hrs/day for most plants.

Practical Setup

Adjustable chains/racks let you raise/lower lights as plants grow. Use a light meter (PAR) for precision if needed. Monitor plant response: stretching = too far; bleaching = too close.