Novembr 16-18—COLUMBIA, SOUTH CAROLINA: Annual show; The Columbia, SC Gem and Mineral Society; Fri. 10-6, Sat. 10-6, Sun. 12-5
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 Post subject: Lamp for gem examination
PostPosted: Tue Nov 06, 2018 9:40 am 
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Can anyone recommend a decent lamp for gem examination? I am thinking of a gooseneck type.
I am a bit confused on the terminology about light- monochromatic, white, natural, different temperatures, etc. Is there a lamp type that works best for general gem examination?


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 Post subject: Re: Lamp for gem examination
PostPosted: Thu Nov 08, 2018 2:28 pm 
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there two bests...one for when you are buying and one for selling lol

look up kelvin scales on lights and learn the difference..2700k will be at the yellowish end of the value and 7000 at the blue end...your question needs to be more specific...are you looking for a light to examine for color or for flaws in the stone?


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 Post subject: Re: Lamp for gem examination
PostPosted: Thu Nov 08, 2018 2:52 pm 
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So now I need two lamps?


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 Post subject: Re: Lamp for gem examination
PostPosted: Thu Nov 08, 2018 5:05 pm 
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I use a clamp down task light that has two bulbs in it.

One is a fluorescent tube shaped in a circle. I buy daylight balanced full spectrum bulbs for this one.

In the center is an incandescent bulb, which I fit with a warmer high wattage bulb.

This setup gives me most of the lighting combinations I need when working with stones.

Daylight
Incandescent
Mixed

I am not sure what size town you live in, but if you have a specialty bulb store go there and the staff should be able to get you sorted out. As you are discovering, you cannot just walk into any store and buy a lamp that is good for stone work.


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 Post subject: Re: Lamp for gem examination
PostPosted: Thu Nov 08, 2018 7:08 pm 
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FWIW, I just bought an led table lamp with both adjustable color temperature and brightness along with other nice features. It's TaoTronics model TT-DL029, under 40 bucks from Amazon. It has 5 different color temp modes.

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 Post subject: Re: Lamp for gem examination
PostPosted: Thu Nov 08, 2018 9:44 pm 
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Most of the color temp adjustable LED are great for some things but lacking in others. They are lacking the full spectrum of light, and so do not show realistic colors despite the Kelvin changes. You must pay attention to the LED Color Rendering Index CRI when choosing if you want accurate colors. Stay above 90% at whatever Kelvin you choose.

Lighting is very complicated these days.


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 Post subject: Re: Lamp for gem examination
PostPosted: Thu Nov 08, 2018 10:08 pm 
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Good info ibwana. Thanks.

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 Post subject: Re: Lamp for gem examination
PostPosted: Fri Nov 09, 2018 9:25 am 
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1bwana1 wrote:

Lighting is very complicated these days.


then you add in what the camera sees compared to your eyes...i had a pink cz i take pics of look almost rootbeer colored


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