As the nation's largest printer, we print over 8000 publications. One smaller title had a color-complaint. Event thought our proofs vs. their cover, didn't match. So our Plant Manager and head of Color-Reproduction flew to NYC to discover they had NOTHING in controlled lighting to examine our product. Just junky office-fluorescents. Retail LED-replacements are a little better, deficient in cyan (needed for Afro-American skin) and red (skin tones, meat, makeup, wines). Without a $6000 color-booth or a $2700 table-top viewing station, we used a D50 lamp in a $2.99 Goodwill tabletop lamp, turned off the overheads, and showed... they matched. We DONATED the lamp (under $20) and bet we'll get no more $2000 trips for nothing. These lamps should be used in every rug-shop, gallery, paint store (perhaps the D65 lamp) and clothing aisle to avoid the mis-matches and returns caused by poor lighting.
I ordered these for my painting studio because my natural lighting is so sad. These bulbs are the next best thing to natural sunlight. They are powerful, white lights with a great temperature balance. All of my colors look true in this light. I will be buying them for the rest of my spaces.