I've been testing mine with a red laser pointer (NOT into my eye!). The glasses reflect a lot, even at a high angle. What does get through does not project beyond the filter itself, and is very dim, even in a darkened room (yes, I'm being careful, I know a reflection can cause damage). When I look at a 100W equiv CFL bulb, it resembles what you photographed. I've also looked briefly at my smartphone flash when in flashlight mode, it is quite dim and 'shifted' toward yellow. Just wondering if I can extrapolate these into a transmission spectrum.

I'm leaning toward throwing on an ordinary UV blocking pair of sunglasses on top and then limiting my time anyway, you can basically see the same thing with the pinhole technique. This is a risk I would take for myself, if my children were still young I would not risk their eyes, nor do it in front of them and tell them they couldn't.

Also, I can distinctly remember staring directly at the sun as a (dumbass) kid on multiple occasions for as long as I could stand it.