My previous viewing booth was an easel and a Solux desktop task lamp. Unfortunatly that has broken in two and is no longer in production. And a fruitless search has failed to locate any desk task lamp using MR16 bulbs. The are all LED with unknown quality.
You might want to take a look at the
Fiilex V70 viewing light. B&H sells it for $195
and there are several end user reviews there. The light is continuously dimmable and has four CCT settings of 3,000, 4,000, 5,000, and 6,500 K. It produces a hard direct light or comes with a magnetically attached diffusion dome.
I have no personal experience with their viewing light. If it's returnable, should it be unsatisfactory for you, it might be worth trying. I have rented Fiilex LED lights for video and still photography on occasion and liked their engineering, features, and light quality and found them quite useful for some applications.
Their LED technology is unique to Fiilex. They engineer and manufacture their own LEDs into what they call a "dense matrix" array. It essentially consists of a large number of tiny LEDs with differing spectral characteristics packed together in a very small matrix array with several addressable color channels within the array. The array in their first light had 50 multi-spectrum LEDs in a matrix the size of a dime. They attracted a lot of attention in the video world, when their first lighting products hit the market, due to producing a hard LED optical light source which differentiated them from the broad LED light panels that had been commonly used.
If anyone is interested in the background technology, I found a couple of YouTube videos with a Fiilex engineer giving basic descriptions of the concepts involved.
https://www.youtube.com/Fiilex's Unique LED Technologyhttps://www.youtube.com/Fiilex's 192-Point LED Calibration ProcessOne purchaser on Amazon did post some
photos of his own spectral measurements. I also discovered that there are people who are
very serious about
measuring the color of wine! The author of the wine color measuring research paper, Mark Fairchild at the Program of Color Science/Munsell Color Science Laboratory, Rochester Institute of Technology, mentions the Fiilex V70 at the bottom of the article in the conclusion (#3) section. He also includes
this table in the conclusions section which gives CCT measurements along with TM-30 scores for fidelity and gamut. (I don't know how Andrew feels about the ever evolving
TM-30 color reference standard)