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ritelec:
An LED bulb with a 60 W equivalent rating has a steady-state input power consumption of about 9.5 W. The equivalent rating means that with 9.5 W of input power the LED puts out a visible light intensity approximately equal to that produced by a 60 W incandescent tungsten bulb. This is relatively correct.
But that is not all that one must consider.
Thermal is a major consideration.
An incandescent bulb can tolerate a high ambient temperature around the bulb without failure. Incandescent bulbs are not very efficient relative to input electrical energy to output visible light. But incandescents produce a lot of IR radiation. The IR energy leaves the fixture just like the visible light does. Thus, a large amount of input electrical energy goes out as radiation, the combination of visible and IR.
An LED bulb can NOT tolerate a high ambient temperature around the bulb without failure. LED bulbs are much more efficient in conversion of electrical energy to visible light than incandescent bulbs, there is heat generated in the LED to perform its function, but this is at low IR frequencies and therefore wasted energy is not much radiated.
Thus, combining the LED low tolerance for high ambient temperature with a lot of conducted heat loss inside a fixture you may fail a 9.5 W LED in said fixture where an incandescent would not fail. LEDs need ventilation.
RFI noise from an LED is another problem.
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