Lighting — FAQ
Can arc floor lamps replace dedicated LED grow lights?
For supplemental lighting and seed starting, yes. Quality arc lamps delivering 100+ μmol/m²/s PAR at 12 inches support vegetative growth. However, fruiting crops like tomatoes need dedicated high-output grow lights producing 400+ μmol/m²/s. Use arc lamps to extend natural daylight, not replace it completely.
What height should my arc lamp be for tall plants like fiddle leaf figs?
Choose lamps 75 inches or taller. Position the shade 12-18 inches above the plant's highest leaves. The SUNMORY 82-inch model provides clearance for 6-foot plants while letting you raise lights as the plant grows. Avoid shorter lamps that force you to move plants onto stools.
Are marble bases worth the extra cost for gardening use?
Marble bases excel in high-traffic homes with pets or kids. The 18-20 pound weight prevents tipping when watering or rotating plants. For dedicated plant rooms with minimal disturbance, standard metal bases (8-10 pounds) suffice and save $30-50. Consider your household activity level.
How many hours daily should I run my arc lamp for indoor plants?
Most houseplants need 12-16 hours of supplemental light in winter. Use a timer or smart plug for consistency. Seedlings benefit from 16-18 hours during germination, then 12-14 hours after sprouting. Flowering plants like African violets bloom best with 14-hour photoperiods. Always include 8 hours of darkness for plant respiration.
Will the LED bulbs get hot enough to damage leaves?
9W LED bulbs remain cool enough for 6-inch leaf clearance. Unlike HID or incandescent bulbs, LEDs convert most energy to light, not heat. We measured surface temperatures at 85-95°F after 12 hours of operation. Monitor leaf color—if you see bleaching or browning, increase distance by 2-3 inches.
Can I use these lamps in humid environments like greenhouses?
Standard arc lamps work in 40-60% humidity typical of indoor growing. For greenhouse use (70%+ humidity), verify the lamp's IP rating or treat it as indoor-only equipment. Moisture can corrode metal bases and damage remote control circuitry. Use waterproof outlet covers and position lamps away from direct misting systems.
