I suppose that's true of any situation in which the 'light-producing element' works at ELV, whether we're talking about incandescent lamps/bulbs or LEDs - in both cases there will be power lost in whatever reduces the voltage from mains voltage to the voltage required by the light-producing element. However, in the case of a simple LED lamp/bulb, I would have thought that the power lost in a capacitor (and bridge rectifier) would be pretty minimal - which suggests to me that losses in the 'control gear' can be an appreciablt factor in bringing down the lumens/watt in a lamp/bulb in which that 'control gear' is just a capacitor and rectifier.
'Under-current', rather than 'under voltage', as far as the LED element was concerned, I would have said. However, if the manufacturers behave as usual, I would suspect that they may well quote the light output at a voltage higher than 230V!
Kind Regards, John
MOD: The OP was last seen on the 28th of Sept, therefore this thread has run it's course and some. Feel free to start another thread and we will try to stitch it together.
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