Has anyone ever stopped to notice that General Electric's 75 watt lightbulbs and (I think also) 100 watt bulbs are only rated for 750 hours of use?
These are the kinds normally sold in the big-name supermarkets and in corner groceries at pretty outrageous prices for a 4-pack.
Meanwhile, the off-brand Chinese bulbs (4 bulbs for a dollar) available from the dollar stores are usually claiming 2,000 to 5,000 hours of use.
I've noticed the off-brand bulbs are usually rated for 130 volts, while GE's are rated for 120. And I've also noticed that the Chinese bulbs do last significantly longer (filaments are also better supported)
What I'm wondering is if GE actually designs its 75watt+ bulbs around a rating of 110 and then marks them up with a 120 volt rating in order to:
1) make the bulb burn brighter
2) make them burn out faster so you have to buy more bulbs.
The vast majority of bulbs in my house are CFL's; I only use incandescent bulbs where short "ON" cycles are typical.
FWIW, I just ordered two cases of 67-watt traffic signal bulbs that should be on my doorstep any day now. I ordered them solely for their long life (8000 hours rated), certainly not for their lumens per watt. My brother had one in his outdoor post lamp which lasted, according to him, fourteen years(!).
True, they don't make bulbs any more like that one in a California fire station (100 years?!!!)- planned obsolescence...
No wire bias here- I'm standing on neutral ground.
Lamps that confuses me is the fluorescent designators for example: F96T12CW F= fluorescent 96= 96" or 8' long T= tubular 12= 12/8ths CW= cool white
But the 4' lamps run differently such as F40T12CW 40 = 40 watts instead of inches F32T8 32= 32 Watts Also what is the real meaning behind a 741, I know it's closer to a cool white and it has something to do with K factor but, why is there a 3500k or some say 735 as high as 850, how do these associate with each other K and the three digit number??
Ever notice at the supermarket they have 150 and 200 watt incandescents on the shelf? Guess where they end up? In the 100 watt rated vapor proof fixtures in the walk in coolers. I have several boxes of these fixtures I kept after we swapped the fixtures out for energy saving flourescents. The only thing wrong with them is all the sockets and wires are fried. Oh and I got a good supply of 150 and 200 watt lamps!