Do light bulbs use more or less elect. when it is cold or hot,where they are? ?

I expect that there is a measurable change, very small for incandescant lamps and quite large for compact fluorescent lamps.

In the case of "old" incandescant bulbs, assume the filament is about 2800K and the ambient air varies by 50K the ratio is about 1.8% so we would expect the resistance and so power varies about that much too. However if the change is to 50K colder, the resistance decreases, so the current increases, so the temperature of the filament increases towards staying the same temperature, so there is a feedback mechanism. How big this effect is would needs to be measured as the shape and housing of the bulb have effects (how well the filament couples to the air). There are also complex mechanisms in the bulb operation of a quartz iodine (halogen) lamp that would have some effect, I don't know what.

With "new" compact fluorescent lamps there is a clear change in the operation from cold startup to warm, as the plasma inside is less stable than a filament lamp. I expect there would be some difference in power, but not sure what, perhaps plasma behaves a bit towards "chaos". The electronics (ballast) would have minor variations too, but they are not significant unless it is a poor design, not able to operate correctly over the range. The link below (which may be a little out of date) claims that the lamp wall (the glass tube) needs to be about 38C when warmed up, and at 0C is about 30% less light. This is because some of the mercury vapour condenses on the wall so there is less available for lighting. Light also reduces about 1% per 1.1C above 25C ambient, such as occurs when enclosed in a fitting. CFLs also have a maximum temperature like 50C, not to be exceeded, for the electronics.

So now we are looking towards LEDs as a better solution? They do inherently change brightness with temperature, but are actually quite stable and predictable about it all.

To put it in more simple terms, the electricity used is primarily the same regardless of where the bulb is placed, whether a cold or hot environment. Cold or hot does not really affect what the bulb tries to draw for electricity.

However, the light output itself can greatly be affected in cold and hot environments. Many cold temperatures can cause compact fluorescent bulbs to be very slow on getting up to their average brightness, and if it is cold enough, they may not even light at all!

No significant difference. The bulb filament temperature is so much higher than any environment temperature that the environment doesn't matter. The age of the bulb is irrelevant.

lightbulbs use more electricity when they are ON!!! simple it doesnet matter in which environment (hot or cold) they are placed in..

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