Yep, the spectrum of light emitted is what matters. A histogram or spectrum intensity curve printed on the cardboard package would be ideal. Sadly, I've never

Yep, the spectrum of light emitted is what matters. A histogram or spectrum intensity curve printed on the cardboard package would be ideal. Sadly, I've never actually seen that in consumer grade stuff. I've found that most LED bulbs you can find in supermarkets are really quite bad in this respect. For my home office, I got something called "True-Light" E27 bulbs. The specs are 12W, 5500K, 920lm, CRI 94. They emit a passable bright, white light. My favourite light source are still E11 halogens. Just pepper the ceiling with them, add dimmers, and hope it doesn't heat up the room too much…