I bought a couple of these (http://www.ebay.co.uk/itm/1113556573...%3AMEBIDX%3AIT). The seller modified them to just red 660nm LEDs. I will be having 2 each side of my screen, but they do need a small modification though. The 3 pin plug is not UK safe as it has no fuse. If you put a UK plug in, put in a 3A fuse. I am also going to change the incoming cable as the live/ neutral/ earth are very thin.
Mark