Jerry Stuckle wrote:
On 11/28/2014 11:11 PM, Scott Dorsey wrote:
Jerry Stuckle wrote:
No, these have electronic power supplies in them. Otherwise they would
dissipate huge amounts of heat. Think about it. LED's run at about 3V.
That means a 9W LED requires about 3 amps of power. 3 amps at 240V is
720W - or about 711W of power wasted. They would be way less efficient
than any other type of bulbs. Plus LED's run on DC and would not work
as efficiently on 50Hz AC.

9W is an enormous amount of power for an LED. The LEDs used to replace
pilot lamps are normally running 10mA, not 3 amps. This is what allows
a dropping resistor to be used.


You are confusing LEDs with LED bulbs. A 9W LED bulb is equivalent to
about a 60W incandescent bulb.

Ahh, I thought you were talking about the high intensity LED replacements
for incandescent pilot lamps. Not the household bulb replacements. The
house lamp replacements have switchers in them.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."