The Ajil BH seems to be bright not because of the sun light from the main LMB but from both those ventilation holes (white pvc pipes) and special light bulbs installed inside each floor.
My suspicion varies about what was in the "consultant" head when he erected the BH.
He must have come from a school of people who thinks that those swiftlet need light to fly inside a dark area.
They must have not be informed about the so call "Echo Location" ability of these special birds.
They must have thought that those birds are similar to human where without light they wont be able to fly down or enter those dark areas.
Hmmm I wonder what other mistakes that this so called consultant made in all those BHs he erected.
The key point that we need to fully understand about swiftlet is that it have this special ability in flying inside a totally dark areas.
If the room that they stayed is too bright they will not breed and they will not erect any nest.
The nesting rooms need to be totally dark however they do need the morning light to guide them to find their way out in the morning.
So it is very important to shut those light but at the same time we must provide them with enough morning light.
Try to learn more about them if you are serious in managing your BH.