If you see a glow in certain areas of your project, then this is usually due to a behavior called "light leaking":
This behavior can be resolved/improved by increasing the thickness of the corresponding geometry or by creating a second non-transparent wall behind, and in some cases, if you have a rather large ground plane in your project, reducing its size is known to help as well.
Light leaks are generally a known issue in real-time rendering. Enscape can be aware of all the geometry in your project only to a certain degree. We're aware of this behavior and working hard on improving it further, but have already made some progress with current releases, so please also make sure that your Enscape is up to date.
If you have any questions regarding this topic in general, or in case you're not sure if it's really light leaking which is occurring in your project and perchance not a another issue, don't hesitate to simply contact us through the feedback button, or directly via firstname.lastname@example.org