This is interesting
It's been too long since I thought about the role of connective tissue in BE. Back when I was trying to follow a non-hormonal program I was very interested in this sort of thing, but I never heard of red light therapy. It seems like it would only increase collagen in the skin itself, which might prevent future sagging and maybe (just maybe) slightly improve existing sagging, but I don't see how it would increase breast size.
I don't think it's ever been firmly proven that it's possible to increase connective tissue (collagen/elastin) enough to increase breast size, but there does seem to be a decent amount of connective tissue in the breast.
I think the honey comb like material surrounding the lobules is connective tissue. There does seem to be a lot of it. Then again, most breast illustrations are drawn in such a way that it looks like most women would still have at least a B cup worth of lobules, ducts, and connective tissue, even if they had absolutely no breast fat at all. That doesn't seem possible, especially since most women with A cups or smaller apparently still have enough lobules to produce the same amount of milk as a large breasted woman. I'm confused and I'm not sure that the various tissues in these drawings are to scale, if that makes sense.
I've also heard that connective tissue is threaded through the fat itself like a mesh. Some women apparently have a much thicker and more tightly knitted mesh than others. Breasts with a lot of connective tissue are called "dense breasts". I've never been able to figure out just how much of the fat volume is made up of connective tissue in people with very dense breasts. Is it enough to make a difference in the actual size? I wish I knew.
I said all that just to say that noogleberry and choline stabilized orthosilicic acid (ch-OSA) might be a good way to increase collagen. The ch-OSA is systemic but the NB is localized, so hopefully the effect of the NB will be enough to make sure that most of the new connective tissue shows up in the breast and not somewhere else. Too bad there's no way to know for sure. You could also try vitamin C and a high protein diet at the same time. Lots of people recommend MSM and collagen but I'm not convinced that they're useful for people who are already eating a large amount of animal protein.