Project Guide

How to Make a Light Box for Growing Seedlings

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1
Choose a Bin

Select an opaque plastic storage bin at least six inches deep that will fit on a shelf or tabletop where you grow your seedlings. A 16-quart see-through storage box works well, and you can use the lid as a waterproof tray for seedlings. Choose a deeper storage bin if you want a taller light box.

2
Select Lights

Choose at least three round, battery-operated LED puck lights. These are the same kinds of lights you might use in a cabinet or closet. Save the adhesive backing to easily attach them to the bin. Extend battery life by choosing lights that are easy to turn off when not in use. 

3
Attach Lights

Attach the lights to the inside bottom of the bin, spacing them evenly. Turn on the lights to test them.

4
Set Box Over Seedlings

Place the box over seedlings on cloudy days. Place a spoon or other small object under one corner of the bin to allow a small amount of fresh air to circulate inside the box, which reduces the risk of disease. Remove the box on sunny days to avoid overheating and promote air circulation. 

5
Elevate the Light Box

Elevate your light box as seedlings grow by placing books, cans or other spacers under the edges of the bin.