All good info, and thanks! Couple points. This SpeedGlas Helmet has an Auto-Range at the top of the small interior knob that you turn from the 10 o'clock position to the 2 o'clock position, that gives you auto activated response from 9-13 darkness. 9-Dark at 10o'c and 13-Dark at 2o'c. (Hope you can follow this!) On the bottom, from, say, from 4o'c to 8 o'c, it gives you the option of 'steady-dark'. (ie Manual) 9-Dark at 8 o'c & 13-Dark at 4 o'c. I replaced the batteries, and now I can see, that in the Manual Mode, (Just looking outside at a white window frame) it, does darken from 8 o'c to 4 o'c. So the Circuitry appears to be OK. Whether that was the batteries, or not ,I don't know. The "light from behind" comments are interesting. Seems like a red-rag, mechanics-type, duct taped to the back of the helmet, safari-style, might be in order! Thanks all, once again! ~Scotty