I went and changed my setup again, this is like the 4th different setup I have had with all the same equipment.

This new setup solved a lot of issues:
1) The fan is now pulling air through both the carbon filter and cooltube
2) Fewer bends in ducting - more efficient
3) With the fan last, now there is no more light leak from the exhaust
4) Should do something with the temps, The temps in the direct light are still about the same, haven't tried to measure it yet..

This change cost me about â?¬3... Just bought some metal reinforcements, rope, and bolts/washers/nuts to hang up the fan.

I put the old tubing on the end of the fan, just for sound insulation because we have to sleep in this room also...