Oh, man. This is all making me so sad. The whole reason we got two new sun tubes in the living room was to pull in full spectrum light, but now I find that in order to counter the blue cast from these things, I might have to add more cast. What I will say is that if your have the 14" sun tunnels from Velux, they sell a "neutral light" filter that is spec'd at around 3600K, so, not sure how that compares to using a theater gel, but it might work for some people, and you don't have to cut it yourself. For my purposes, I am going to have to do some other experimenting, because I need more of the spectrum, not less of it (for me to do artwork, but also my plants). If anyone has been able to track down the source of the bluing (is it the diffuser, or the inside of the tube, or possibly the dome on top?), that would be a huge help. Of course, I will check for the blue film! Thank you all! Addendum: I just took the diffuser out and looked at the light coming in, and it is definitely not the diffuser causing the bluing, nor is there a film in there. It's the top dome I think. I conveniently have an older sun tube in my bathroom that does not do the bluing thing, and it also does not have a tinted dome on top, so that seems like the main difference between them. Now I am wondering if the dome can be replaced maybe with something not tinted...

Stunning it may be (or not). But if you are concerned with privacy why would anyone do this? There are solutions to let light in, have a view of who's at the front door, and still maintain privacy. These solutions involve transom lights, side lights and door lights above eye level. Another option is to use partial or full height glazing and install movable wood louver panels on the inside, which can be open in the day time and closed at night as may be desired by the occupants.

Thanks. was hoping for different solution. reading those adhesives dont always work too great

I can speak only to having done our master bath and closet, and it seemed crazy to me that the previous color was SW Accessible Beige (not dark) and we were redoing in BM Super White. The painters did not prime bath area before painting saying they prefer to just use the paint in more coats, which was absurd to me at $75 a can of BM paint! Took them 3 coats. I was responsible for doing the large closet and although I primed first, still it took two coats for full coverage. I would insist on priming 2 coats if necessary (and cheaper), matter of fact have the primer tinted to the room color might help too. I swear paint is getting thinner requiring more coats no matter what. I've used Behr, SW and BM and find this to be the case. Good luck to you!!