25 Aug
2014
25 Aug
'14
12:36 p.m.
The difference in LED efficiency / intensity is truly
stunning, though..
the new LEDs required 20X the resistance of the old 70s units - two of
Somethign that mazd me : Take a modern white LED and a 9V battery. Hold
the cathode lead of the LEd with one hand and touch the anode lead on the
+ve terminal of the battery. Not touch the -ve terminal of the battery
with your other hand. In effect you are using your body as the LED series
resistor. When I tried it I got a noticable glow from the LED. Not
bright, but I could certianyl tell if it was on or off.
which had "just failed". When was the last
time +I+ ever saw an LED go bad?
That would be second to never, pretty much..
Iv'e had LED segnemnts fail in old displays (e.g in HP calculators), but
to be fiar it's often the bonding wire that breaks not the LED die iteslf.
LED toruhes (flashlights) over here tend to just conenct white LEDs
acorss a 4.5V battery (at least the cheaper ones do). This is nto kind to
the LEDs, and I've had a fiar number fail. I must have replaced at least
as many LEDs in cheap LED torches as I ever replaced filament lamps in
traditional torches. Hmmm...
-tony