How far should grow lights be from plants?

Correct distances of lights protect from burning and encourage healthy growth. Different distances are required for various types of plants and other lighting methods. The lights of LEDs require different distances than fluorescent lights. The succulent needs closer distances than the fern does. Once a week, I measure the distance, giving myself a chance of precision with a simple ruler.

Perform the hand test prior to positioning your luminaires. Hold your hand at plant height for the count of 30. If your hand feels hot, your lights are too near. If you feel comfortable warmth, the lights are at the proper distance. I conduct this test weekly, as seasonal changes influence ambient temperatures.

Change heights as plants grow. Raise lights about 1-3 inches each week. Seedlings proliferate and require frequent changes; mature plants grow slowly and usually don't need adjustments more than once a month. I have a pulley system that allows me to adjust heights rapidly and consistently.

Identify indicators of improper distance. Light burn appears as white spots on the leaf centers. Leggy growth indicates too far away. Uneven growth means it's time to move plants to ensure a better rotation. I take weekly photos of my plants to acknowledge changes and make adjustments.

Better spacing enhances the resilience and yield of plants. Correct spacing reduces the amount of energy wasted. Over time, plants evolve into larger, stronger structures. Harvest yields increase when plants are placed more efficiently. After adjusting the spacing of my basil, my yield doubled. Start measuring your lights today!

Read the full article: Indoor Plant Lighting: A Complete Guide