I built a small light box this past spring using an under the counter fluorescent fixture which was only 18" long with two bulbs. It worked, but just barely. It didn't provide as much light as the seedlings wanted or needed.
I will build a larger box this winter for my spring seedlings using two standard sized ceiling fixtures mounted side by side with two bulbs each. Does anyone know what the width and length of the standard fixtures is? What bulbs should I use?
I will build the fixture assembly for the bulbs to be only 3" above the seed trays during germinating and early growth and elevate the fixtures as the plants grow. Any other special requirements for the bulbs, fixtures, distance between bulbs and plants?
I don't plan on providing heat pads, but the seeding trays will be sitting on a rubber surface on top of a heavy metal work bench which is enclosed underneath. I plan on using an incandescent light in the enclosed space underneath the seeding trays to maintain a growing surface temp of about 80 degrees during germination. Does that sound about right?
The fixtures will be on a timer set for sixteen hours on and eight hours off each day. The incandescent bulb will stay on to maintain bottom heat until all the seeds have germinated.