Currently, this is how bright a single object with a Lumin is (in pitch darkness):

On the right side of the picture, you can see how bright a second Lumin overlayed over the first one is.
I want a single Lumin to look more like maximum daylight brightness:

Currently, stacking a whole bunch of Lumins on top of each other just gives me this:

Been playing around with ILM.java for a while, but haven't managed to get the effect I want yet.