Reference
Using Grow Lights for Indoor Plants
The short answer
When natural light is short, supplemental grow lights (fluorescent or LED) can supply what indoor plants need. Set lights on a timer so plants get a consistent day length, and adjust the fixture height so the light sits close enough to be useful without scorching foliage; fixtures hung on chains make this easy to fine-tune.
Follow the specific distance and duration guidance from an Extension source for your plant type, and keep the light on for a fixed daily period rather than around the clock, since plants also need a dark rest period.
Types of light
Fluorescent and LED fixtures are common, energy-efficient choices for home growers. LEDs run cool and can be placed relatively close to foliage.
Distance and daily hours
Position and run time depend on plant type and fixture intensity. Use a timer to automate a steady light period, and raise or lower a chain-hung fixture to control how much light reaches the leaves.
→ Too much light too close can cause leaf burn; too little produces spindly, weak growth. Check your Extension source for figures matching your plants and fixture.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Iowa State University Extension — How to Set Up Supplemental Lights for Indoor Plants — Supplemental lights on timers with adjustable fixture height support indoor plants.
- University of Missouri Extension — Lighting Indoor Houseplants (G6515) — Light type, duration, and distance guidance for indoor houseplants.
- University of Minnesota Extension — Lighting for indoor plants and starting seeds — Fluorescent and LED options and daily light duration for indoor plants.