On or around Wed, 21 Dec 2005 14:17:58 +1000, "Karen Gallagher"
<
[email protected]> enlightened us thusly:
>LED's are current driven, not voltage driven - fit no resistor & something
>will have to blow or burn. You should be able to look up the required
>current for the LED you have and chose a resistor to suit the voltage you're
>running at, then the LED will work correctly. Resistor in series, of course,
>not in parallel.
yeah, but we're not talking straight LEDs, we're talking arrays with
suitable resistors to run on 12-14V supply.
However, the old-style thermal flasher units rely on the current in the bulb
to make 'em work right, and the new-style electronic flasher units use a
reduction in bulb current to trigger "bulb failure" mode and flash at the
wrong speed (which the old ones did anyway). Unless, of course, you're
talking about the one in mine which has the track to the bulb outage pin on
the IC cut, so that it flashes normally all the time, even with the LED
"bulbs".
what's odd is that the amber bulbs are made with LEDs at 8800 mcd each max.
axial intensity, while the red ones are 7500mcd. But the red ones look
brighter, subjectively, than the amber ones, in identical bulb housings.
I emailed them about this, and suggested that they might look at brighter
ones for the amber things, if such exist. 'course, it might be possible to
drive them harder...
--
Austin Shackles.
www.ddol-las.net my opinions are just that
"Any man's death diminishes me, because I am involved in Mankind; and
therefore never send to know for whom the bell tolls, it tolls for thee"
John Donne (1571? - 1631) Devotions, XVII
