Lighting Advice for my Propagation Tatble

I have mine set up so that the light reflector forms the actual roof of the propagator. Its not a perfect fit so some of the heat will escape, but it also helps with air circulation and prevents a build up of condensation. Swings and roundabouts I suppose.
Heres a link to the manufacturers website, it tells you much more about them.
http://www.envirolites.co.uk/index.html