If you live in a climate where you need to heat your home then do you really save energy? The small amount of thermal energy that you were getting from your incandescent bulbs will now just be replaced by a little bit of extra heat from whatever you are using to heat your home (assuming that your home heating is thermostatically controlled).
Of course is you live in a hot climate then you're in a win-win situation since you no longer need to also pay to pump out that extra little bit of heat that your incandescent bulbs were generating.
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If you live in a climate where you need to heat your home then do you really save energy? The small amount of thermal energy that you were getting from your incandescent bulbs will now just be replaced by a little bit of extra heat from whatever you are using to heat your home (assuming that your home heating is thermostatically controlled). Of course is you live in a hot climate then you're in a win-win situation since you no longer need to also pay to pump out that extra little bit of heat that your incandescent bulbs were generating.
I just tried it from New Zealand (using a SE T610 on the Vodafone network). It worked fine.
In Our Time on BBC Radio 4 explores a number of interesting science topics: http://www.bbc.co.uk/radio4/history/inourtime/inou rtime_science.shtml