I think a mirror might be good? You would need to angle it so that the light reflected would shine on all the plants that would otherwise be in the dark.

How about trying to tape together some potato chip backs. Wash and flatten them first of course.

A board painted with flat white paint would work.

Jon

Jonnys, Looks like you have a hanging set-up there. Go to Wal-Mart or a camping store, buy a "space blanket", which is a lightweight shiny aluminum blanket (developed for NASA) should be about $1.25 to $2.00 -- and hang it behind your plants. I always have one in my car in the winter, "just in case", and I have even draped it over my freezer when we have a power outage. I'm planning to put one on the wall where I have my grow lights.
Good luck.
Sunny

Hold the phone!

The setup you show is meant to be rotated about the central axis. Just turn the thing every other day and you'll get 3.5 days a week full sun on each side!

If you're bent on using reflected light, do what I've done in the past; use foil-backed sheet Styrofoam insulation. You can buy a 4' by 8' sheet at Home Depot. It cuts with a razor knife and is durable, but won't kill you if the wind gets hold of it and throws it your way!

sunnyside

I didn't ask the question, but more light for seedlings is always good. I like your suggestion about using a space blanket. They can also be draped over plants in cold snaps. I believe one side reflects light/heat and the other side repels them (one side turned in keeps you warm, the other side turned in helps keep you cool), so you need to know which side to use for the purpose you have in mind.

My fluorescent lights are on a timer and sit on the floor with the seedlings under them. Heating pad under it all. I think one of those space blankets draped over the whole shebang would keep everything warm and well-lit!

jonnys

What kind of holder do you have those cups in?

Thanks for all the replies :D

freemangreens, I do currently rotate it, though I thought it would be better to reflect some light, that way my plants on the backside can still recieve some refracted light, better than nothing? Maybe, but I thought it couldn't hurt. Another good idea about the insulation, I might even be able to cut it on the foam side like they do with drywall, and create a hinge.

sunnyside1, that is a great idea, I also like the idea of using it over top of plants for dips into the cold, which for me is below 50, burr :D

As for now, the wind doesn't seem to like a sheet draped over my teepee. So I will set something else up soon. Thank you all again for your replies.

Don't use mirrors - they can actually create hot spots that will burn plants. If you were inside, most of the suggestions would work well. Since you are talking outdoors, and actual sunlight, a smooth piece of 1/8" plywood or other weather sturdy sheet painted FLAT white is your best reflector. Do not put it right on top of the plants, keep it a foot or so behind. I have when faced with a late freeze or inclement weather, ran 2' of carpet padding (black) underneath a strip of white plastic that was angled towards my seedlings and managed to save most of them. These were in the ground. The blabk trapped heat enough to help them through during the day, and a cover saved them at night. Good luck. TiMo