I have been using Soraa MR-16 lamps in several of our galleries for 5-plus years now. I love the snap lens system- and the way the light looks when new, however, I find that they turn yellow long before they die. This can make an artwork look pretty bad, so I'll often change the yellow lamp out.
They are quite expensive!
Sometimes I'll write the date in Sharpie on the lamp when I install them, but no data yet. ( Meaning I have yet to de-install one of the lamps with a date.)
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