Make these beauties using empty tropicana juice cartons. However, I would add a pvc pipe a little bigger than what's on these lights or you'll wind up throwing all that hard work away when the lights die out on you. With pvc, you can pull the offending light out and replace it with a new one, if it can't be fixed.
How to Build a Rain Barrel. This could catch the rainwater off a greenhouse or shed.: “Break-Through Organic Gardening Secret Grows You Up To 10 Times The Plants, In Half The Time, With Healthier Plants, While the "Fish" Do All the Work.