Replacement of traditional light bulbs with energy saving recommended ones will reduce lighting costs over the lifetime of the bulb, and they last up to 12 times longer than ordinary light bulbs. Also consider selecting low energy light fittings when redecorating as this will help improve the EPC rating.
Energy saving light bulbs are actually compact fluorescent lamps - and are fundamentally different to traditional light bulbs that are incandescent lamps. The latter can be purchased with different wattage outputs - the typical light bulb used in the home is either 60 watts or 100 watts, which means that is how much power they use up in an hour. The low E equivalents use only 9 or 11 watts each hour, so represent a substantial power saving, even though they give the same amount of light out.
The downside to Low E light bulbs has been that they are more expensive than incandescent bulbs - but this is offset by their much longer life.
The glass tubes in the bulb that you can see are filled with gas, which is mercury vapour. The bulb also contains electronic ballast, through which electricity flows when the light is switched on. This causes the mercury vapour to give off light in the ultraviolet range, which, in turn, stimulates the phosphorous coating on the inside the glass tubes to produce light in the visible range.
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