Subject: Re: Best way to power array of LEDs?
Summary: What do you think of these ping times eh?
References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <firstname.lastname@example.org>
X-Newsreader: Forte Agent 1.91/32.564
Date: Sun, 06 Oct 2002 15:25:32 GMT
NNTP-Posting-Date: Sun, 06 Oct 2002 11:25:32 EDT
On Sun, 6 Oct 2002 07:02:46 -0700, Watson 'Atto Parsec' Name
>See my previous post re your lame statement.
Get a clue. Nobody would use a resistor, warmed to the point of
changing value in such a design. The bulb yes. It would be a very
wasteful circuit though.
Not only that, but I would much rather have a warm, made for the
purpose resistor dissipate its heat through conduction through its
body and leads that a pure IR emitter such as a heated filament any
day. With the bulb, its leads stay cool and ALL of its energy get
transmitted to surrounding devices via IR. With the resistor, it has
a smooth glazed finish which has a very low emissivity, and THAT makes
it conduction cooled for the most part, it has a metal oxide over a
small cylinder of ceramic with end caps and leads. That heat is
carried off in an entirely different way, and regardless that the heat
generated is the same, the enclosure of the unit will not heat the
I can heat a matte black painted cardboard box with a 100 watt light
bulb quite well, but a 100 watt resistor won't do that job.
Stop and go traffic would certainly be some long stints of nice,
warm, cozy light bulb filaments heating cavities and devices.
Put that in you physics today brain pipe and smoke it, Chucko.
I never said that the power or heat would differ.