the worst thing is the diffusor (plexiglass).
i think it absorbs to much light i think i will look for something thinner. any foil etc. thinner and less absorbing light.
@ martinp: yes i have located the laamp in the axxis of the lighthole with the heatabsorbingglass. aprox. 3 cm away from the diffusorplexi in the filterdrawer.