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LED brightness?

 
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vidarf



Joined: 12 May 2006
Posts: 504
Location: Narvik, Norway

PostPosted: Tue Apr 10, 2007 1:26 pm    Post subject: LED brightness? Reply with quote

Hi gents!

How bright are your LED's for the annunciators (microcandelas)?

If this topic has been covered in the past, please let me know! The search didn't help...
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RocketRod



Joined: 02 Jun 2005
Posts: 293
Location: Colorado Springs, CO

PostPosted: Tue Apr 10, 2007 4:37 pm    Post subject: Reply with quote

Mine are bright. Just about right I think, using 2 LED's in each. Although my interface (non FDS) software allows me to set brightness. Can't discuss any more, not fair.
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vidarf



Joined: 12 May 2006
Posts: 504
Location: Narvik, Norway

PostPosted: Wed Apr 11, 2007 11:25 am    Post subject: Reply with quote

Okay, but do you know HOW bright in microcandelas? There are LED's that are 2500 mCd, and there are 70.000 mCd ones.

Just want to know what to "shoot" for. Smile I don't want to feel like I'm flying into a supernova each time a annunciator lights up...
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RocketRod



Joined: 02 Jun 2005
Posts: 293
Location: Colorado Springs, CO

PostPosted: Wed Apr 11, 2007 11:33 pm    Post subject: Reply with quote

Nope, only that they are 3.3V. From what I've seen they range from 1500-10,000 mCd, and 3,000 seems to be very common. Bet mine are about 3,000. I would think that something rated at 70,000 would be way too much for a pit. I mean you want to notice them, not melt the annunciator.
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vidarf



Joined: 12 May 2006
Posts: 504
Location: Narvik, Norway

PostPosted: Thu Apr 12, 2007 2:33 pm    Post subject: Reply with quote

Very Happy Yep, that's my thoughts too. Smile

3000 mCd. Sounds very reasonable. Thanks! Smile
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CEL



Joined: 11 Mar 2007
Posts: 4
Location: Oslo, Norway

PostPosted: Sun Apr 22, 2007 8:04 pm    Post subject: Reply with quote

Do not look for luminous intensity (candela) only. The definition for Candela (cd) is the power emitted by a light source in a particular direction. If you look at the table on this site http://led.linear1.org/how-do-i-convert-between-candelas-and-lumens/ you'll notice that from a beam angle at 5 to 45 the cd/lm factor drops significantly. A LED with 3000mcd and beam angle of 5 Deg is not a good choice for annunciators.

For my amber annunciators I use a LED with a wavelength of 591nm, 25 Deg viewing angle, and a luminous intensity of 1000mcd. They are so bright that at 2.1V it is difficult to read the text on the annunciators.

So look for mcd and beam angle.

Vidar, you can buy them at ELFA. http://www.elfa.se/pdf/75/07501661.pdf

Another thing I found out while searching for the right color, is that many color-deficient people find green and yellow colors difficult to differentiate. This could be a problem with traffic signal lights. The limit in the CIE recommendations is 498 to 508nm for green and 585 to 593nm for yellow traffic lights. By raising the frequency for the yellow light, it is easier to differentiate it from green. From 591nm you move towards orange and red. That color is called amber.

Regards,
Carl
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Michal



Joined: 02 Oct 2006
Posts: 234
Location: USA

PostPosted: Sun Apr 22, 2007 10:35 pm    Post subject: Reply with quote

Some things are easier with the real Korry indicators.

Others, not so easy... Rolling Eyes
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vidarf



Joined: 12 May 2006
Posts: 504
Location: Narvik, Norway

PostPosted: Mon Apr 23, 2007 11:38 am    Post subject: Reply with quote

Thanks, Carl! Smile Got a package from ELFA today, so I know what to do now. Thank you very much! Smile
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