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Article #20298Re: Super LEDs from RS
From: John Purbrick
Date: Mon, 02 Jan 1989 17:28
Date: Mon, 02 Jan 1989 17:28
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The original article was about powerful visible LEDs, rated in candelas, which is normal for visible light. How does this compare to infrared LEDs, which are usually rated in terms of total watts and watts/sterradian (watts radiated into a unit angle at the brightest point)? Are the visible lamps catching up to the IR ones? Note: Visible light, measured in candelas, is nonlinearly related to actual power, because the candela takes into account the varying response of the eye to different colors. An infrared lamp rates 0 candelas, although most Hewlett- Packard IR LEDs seem to be near-infrared and emit a small amount of visible light too. "Aids alignment", as the catalog says.
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arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!bbn!mit-eddie!bloom-beacon!hermes!jpexgReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!bbn!mit-eddie!bloom-beacon!hermes!jpexg From: jpexg@hermes.ai.mit.edu (John Purbrick) Newsgroups: sci.electronics Subject: Re: Super LEDs from RS Summary: What's that in w/sqcm?? Message-ID: <3258@hermes.ai.mit.edu> Date: 2 Jan 89 17:28:36 GMT References: <7200022@silver> <7200025@silver> Organization: MIT AI Lab, Cambridge, MA Lines: 11