Lighting a 4-Foot Terrarium: T8 vs T5 for High-Light Carnivorous Plants

A grower planned a 4ft × 20in terrarium for Byblis, Cephalotus, Nepenthes, Heliamphora, Drosera. Considered 4× T8 40W (10,000 lumens) vs. T5 (20,000 lumens, 3× cost) vs. 6× T8.

Assessment

• 10,000 lumens is likely adequate, but monitor plants.
• Lumens measured at 12"; at 20" distance, intensity drops significantly.
• Adjust plant/light distance as needed.
• Ventilation essential for heat/humidity escape.

Practical Approach

Start with 4× T8; if colors are dull or sundews are dry, move plants closer or add tubes. Share results for community knowledge.