Warm White Energy

energy saving bulbs question?
I have a pear shaped warm white CFL (Compact fluro light) it is 11w =60w
how come when i turn of the lamp and touch the light it is quite warm to touch...i thought the lights were supposed to be energy efficient.?
also is it better to leave them on or to keep switching them on and off when you are not in the room.
thanks.
but i read somewhere that switching them on and off reduces their lifespan and to get a decent saving they should be on for 4 or more hours. i think??
by lifespan i mean the number of hours life you get out of them
CFLs and Incandescents work by two completely different processes. Incandescents use electricity to heat up a filament which in turn produces light. In a CFL, the heat produced is a byproduct of the excitement of gas particles within the CFL which are used to emit light. For comparison, in incandescents 90% of the input energy is transmitted as heat, while only about 30% in the case of an CFL.
CFLs are more efficient by nature, producing a lot less heat and using about a 1/4 of the energy of an incandescent bulb to produce the same amount of light.
As for your next question, CFL manufacturers recommend only using cfls in fixtures that you may leave on for extended periods, say 15 minutes at a time, as frequently turning them on and off can shorten their life.
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Sku.26514 E27 81-LED 3500K 410-Lumen Energy Saving Light Bulb - Warm White (180~240V)
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