Choosing the Right Fluorescent Light Wattage for African Violets

Choosing the Right Fluorescent Light Wattage for African Violets

A grower using 34- or 40-watt cool white fluorescent tubes asked if 60-watt tubes would burn their African violets and whether lights should be raised higher than the usual 12 inches.

Light Intensity Considerations

African violets typically thrive under 40-watt fluorescent tubes placed 12–15 inches above the plants. Higher wattage (60W) increases light intensity and heat, which can scorch leaves if not adjusted. If using 60W tubes, raise the fixture to 18–24 inches and monitor plants for signs of stress like leaf curling or bleaching.

Best Practices

• Stick with 40W tubes if possible; ask your supplier to keep them in stock.
• If using 60W, increase distance and reduce duration (12–14 hours daily).
• Use a light meter to ensure 1,000–1,500 foot-candles at plant level.
• Cool white or full-spectrum tubes work well; avoid warm white only.

Consistent, appropriate lighting promotes compact growth and abundant blooms.