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Article #260Re: Best way to power array of LEDs?
From: Don Klipstein
Date: Sun, 06 Oct 2002 04:50
Date: Sun, 06 Oct 2002 04:50
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In art. <3D9D3A1F.97DB97B4@prontoREMOVETHISmail.com>, AC/DCdude17 wrote: >X-No-Archive: Yes > >Many LED stoplights are PWM operated, so it's operating at high >instantaneous power at low duty cycle. Next time you see bus stoplamps, >shake your head while you look at it, you'll see it's pulsed. I do lots of rolling my eyes up and down to see some sense of light output waveforms of all kinds of light sources. I can definitely say that pulsing is sometimes but usually not done in LED stoplights, and especially not in most that see use at only one brightness level. And I have driven and cycled behinnd enough buses! - Don Klipstein (don@misty.com, http://www.misty.com/~don/ledp.html)
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2002-10-05 21:55:22 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!logbridge.uoregon.edu!newsfeed.wirehub.nl!yellow.newsread.com!netaxs.com!newsread.com!grr!news.misty.com!don From: don@manx.misty.com (Don Klipstein) Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: Sun, 6 Oct 2002 04:50:32 +0000 (UTC) Organization: MGT Consulting Lines: 14 Message-ID: <slrnapvghj.hah.don@manx.misty.com> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <3D9D3A1F.97DB97B4@prontoREMOVETHISmail.com> NNTP-Posting-Host: manx.misty.com X-Trace: news.misty.com 1033879832 23374 198.137.254.20 (6 Oct 2002 04:50:32 GMT) X-Complaints-To: abuse@misty.com NNTP-Posting-Date: Sun, 6 Oct 2002 04:50:32 +0000 (UTC) User-Agent: slrn/0.9.6.2 (SunOS)