Ah yeah my 34W lamps are noticeable dimmer than the 40W lamps in the garage but they do stop flickering eventually as long as the overhead door to outside is shut. The garage has a heat/AC vent and is insulated so it could be climate-controlled, but we keep the vent shut since we don't use it as a workshop or anything (though I do work out there, but I like a little nip in there in the winter and in the summer I work outside). So we find it a waste to heat/cool the garage since it all gets lost whenever we open the overhead door to take off or come home in the car. Even with the vent shut, the garage is more stable than outside. It's probably 45-55 degrees in the garage in the winter and maybe 75-80 in there in the summer (but humidity is the same as outdoors so in the summer, it feels much "grosser" out there than in the AC-controlled house. Some of the AC air leaks through the vent but there's no return vent in the garage so the humidity isn't filtered out of the air in the garage, which isn't a big deal since we only use it to store the car most of the time.
Yeah, the electrodes are very dim and bluish. It looks as if the tube has electrode guards, though GEs don't have them. I wonder if maybe the starting circuit on the ballast is going. I don't recall if other brand tubes do that. I don't think so... Just smaller or thinner electrodes I guess. i think other LG members have seen the same thing with newer T12 GE tubes. I wonder if they're using T8 electrodes lol (assuming they're different).
BTW, the 90W Sylvania SuperSaver in the garage went out! The last original keyless incandescent in service died! I will stick in a new 100W lamp when I dig one out (I must have a spare somewhere and if not, I'll get a BT15 halogen or something lol) The garage is actually decently-lit without the incandescent, but it's unevenly lit since the fluorescents are both on one half of the garage. This is the only keyless socket to remain up long enough to outlast its lamp lol. The other three were replaced with duplex receptical plates and linear fluorescents before their lamps even died! (well the laundry room had a 3-way CFL with a worklight reflector for a while since the incandescent was too dim but the incandescent still worked when it was removed.) Funny thing is, the incandescents were originally enough light to see by but if I were to take down the fluorescents and stick the incandescents back, it would be WAY too dim lol.