Archive for the ‘Optics and Light’ Category:

2020-06-06 Clark Refractor Telescope At Santa Ana College

From FB comments June 6 David Wise I went up there on the roof of Russell Hall at SAC to do some work and I went into the observatory to see the Clark refractor telescope. Old timer wasn’t used because of the air conditioners running a few yards away, and the observatory door hinges were

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2020-06-05 UV-C Germicidal Lamps Real Or Fake Banana Test

Clive tests three UV-C germicidal lamps to see if they are really putting out UV-C sterilizing light in this 3 minute video. He uses the green banana test. It’s obvious how the cheap LED lights don’t put out any germicidal UV-C. The UV-C wavelengths are blocked by regular window glass or the clear epoxy used

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2017-01-18 Simulating An Analog Meter

A detector or discriminator in an electronic device might need to be adjusted to a very few points on a scale of a hundred or more points.  A digital indicator typically indicates only a fraction of that, possibly 16 points.  This is why the analog meter is still useful: it can indicate a small change

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2016-05-21 Monocular Mount For Phone Camera

I went through something like this last year, and I looked around online for something to solve the problem.  But I came to the conclusion that I didn’t like almost all of them for one reason or another.  Usually it was due to cheap, flimsy plastic.  So I began again with the intent to solve

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2016-02-16 Daylight LED Light Prices

I had to go to the big box home improvement store yesterday, and although I didn’t find the screws I was looking for, I did find that they had LED lights on pallets. I saw both warm white and daylight LED lights of the ‘stick’ kind, I believe one maker calls them bright sticks.  I

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2015-03-26 CRI Not The Whole Story

I got another email from Designing With LEDs about removing the fluorescent lights from a bathroom and replacing them with Cree LED lights.  The blog shows the charts from a spectrometer showing the difference between the fluo lights, which are deficient in the red, and the high CRI LED lights which have much better lighting

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2014-08-25 Mini Fluo Light And Another Use For Epoxy Resin

I found some soda straws that are thin and about the same color blue as the blue LEDs I got from goldmine-elec.com.  I got the idea of using a soda straw from Quantsuff at quantsuff.com.  He used two white LEDs in the ends of a short length of white translucent (semitransparent) soda straw to give

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2014-08-22 Colored LEDs For Decoration, Not Illumination

I received a bag of 200 blue LEDS in milk white packages from Goldmine-elec.  These put out a diffused blue light that has a wide beam pattern. I’ve been thinking about colored LEDs, and I’ve come to the conclusion that the colored LEDs I use don’t need to be in a clear case and the

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2014-04-16 Kruithof Curve

Paul sent me a link to a Wikipedia article, http://en.m.wikipedia.org/wiki/Kruithof_curve which is new to me.  I was introduced to some other illumination terms such as correlated color temperature by the website donklipstein.com which has a wealth of info on lighting and LED lights. Before CFL and LED lights, we were using incandescent lights which have

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2013-12-18 10 Watt LEDs Have Finally Arrived

Well, the LEDs I ordered more than a month ago have finally arrived.  They are 10 Watt(!) 900 lumens from Electronic Goldmine for $6 (USD) apiece (I checked their website and they seem to be sold out).  The reason why it took so long was mostly my fault.  They were shipped to my previous address,

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