Maybee you have to manually check the Glow in Effects for each light?

In relation to trees, is anything in the zip of help? You will note that I not only started with different tree sizes but also fiddled with the shading of the leaves in tree 2.(Well image in place of zip)

Adding all the potential parameters as well in the replicator should addd up to a very varied tree landscape.  Could have added say people into the mix!  Now THAT I am going to work on.

bwtr