Estimating Grow Lighting Needs

September 18, 2018

Much of the information provided online or by manufacturers for calculating your lighting needs is based on watts. While energy use is an important consideration, it is an input, not an output.

LED bulbs are available in various shapes and sizes.
PC: Leslie F. Halleck

Without any additional sunlight, you can estimate that:

• A 1000-watt lamp lights a 36- to 40-square-foot growing space.

• A 600-watt lamp lights a 20- to 36-square-foot growing space.

• A 400-watt lamp lights a 12- to 16-square-foot growing space.

• A 250-watt lamp lights a 6- to 9-square-foot growing space.

• A 150-watt lamp lights a 3-square-foot growing space.

Gardening Under Lights Book


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