Hi all With using Tin foil as a reflector, the foil gets a dull colour due to evapouration taking place. I have used reflective self adhesive graphics material , it works well, but over a period of time, a year the coating does start to tarnish. I have found however the best yet reflective material, it is a highy polished aluminium sheet that the guys use for sky lights. I managed to get a length thereof, it has a plastic covering sheet to protect the polished area,once removed, man I tell you, it is the best yet, that I discovered. Unfortunately these sheets are quite pricy if one wishes to purchase.last price quoted from the supplier,as this product is imported from belguim R 220.00 for a size of 1mtr x 400mm. The sheets are all precut, so all one has to do, if you have friends in the steel business who has a bender, then they can bend it to any profile you want, but remember, if you do bend it, and you make an error and you try to straighten it again it will break. Try to cut the sheet via a guillotine and bend to maximise the light output. If anybody is interested, I can try to get some more,bend and cut it .