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How many mcd's in a light bulb    
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John1397



Joined: 16 Aug 2007
Posts: 44

PostPosted: Tue Oct 13, 2009 9:23 am    Post subject: How many mcd's in a light bulb Reply with quote

How many mcd does a 100 watt 120 volt ac incandescent light bulb put out?

John
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JTS1957



Joined: 21 Jan 2009
Posts: 2324
Location: Far, Far Away

PostPosted: Tue Oct 13, 2009 8:21 pm    Post subject: Reply with quote

What's McDonald's Corp. (MCD) have to do with this? Laughing

How bright is an MCD?

MCD stand for "millicandela" or 1/1000 of a candela.
This a unit of light energy of a single color, and in a single direction. For example: if you stand a few feet from a 100W light bulb, your eyes will get about 120 candelas of brightness reaching them--that's 120,000 MCD.
The little LED's you see on cell phones may be about 20 or 30 MCD.
This is a very rough idea of what it means. For a more formal explanation, go to http://en.wikipedia.org/wiki/Candela and read all about it.
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