Another option is reflectixs (an insulated reflector foil made to back a heating element such as a radiator) which can be found at most home improvement stores. It is actually better than Mylar or panda film and more durable but again, you have to consider the costs + the increased risk of mold & pests. You will only gain a few lumens over flat white paint.
bigsby Reviewed by bigsby on . i finally got the space built for my babys ok,after all my hard work and thinking i finally got the space where to build my growbox room:D i only live in 1 bedroom flat..:D ok heres the pictures from outside cos in nothing done inside yet.. 1.thats what you see when i walk in.just 2 wardrobes in the corner. 2. smaller wardrobe. 3.open the door,and push the backpanel.. 4,and voila perfect space for few sexy girls.. Rating: 5