Post subject: Re: Gemolite V LED replacement darkfield lamp
Posted: Mon Apr 18, 2022 12:28 pm
Established Member
Joined: Wed Jan 02, 2008 4:24 pm Posts: 20 Location: East Tennessee
As I wrote in my earlier post, the Gemworld Guide lists about 6200K as the color temperature for judging colored stones. The bulb I sourced, at 6K, is pretty close to that, so I assume it would be a pretty good match for judging color. I think the overhead fluorescent on the Gemolite is also at a daylight temperature and is specifically for judging color grades in colorless diamonds...
As I said earlier, I don't know how close to a continuous spectrum the LED bulb comes, but I didn't see any color shifts in the stones I examined. In these days of multiple light sources, I think it's always a good idea to look at a colored stone under a variety of light sources and to take the stone outside or to the window to see what it looks like in "real" daylight for critical work.
_________________ "royjohn"
Faceting Custom Gems in East Tennessee
Buying and Selling Facet Rough
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Post subject: Re: Gemolite V LED replacement darkfield lamp
Posted: Tue Apr 19, 2022 1:22 pm
Gold Member
Joined: Mon Apr 16, 2007 12:05 am Posts: 1499
A 6000K LED lamp provides a continuous spectrum across the visible range. Typically there is a prominent blue peak in the spectrum, but otherwise it is a good mimic of daylight.
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