I would only worry about sunlight. Generally if you’re out of the sun, you’re good.
However anything that emits U/V radiation can degrade color from objects. Artificial light from fluorescent or incandescent bulbs does emit a small amount of U/V radiation and constant, continuous exposure could probably degrade the cards over a long period of time, but periodically looking at your cards in bright light is not going to hurt it.
For what it’s worth, LED lights, I believe, don’t emit any U/V radiation at all.
Edit: If you would like to display your card I would urge you to get a U/V protective frame or case for the card. This is true for any printed collectible and is display 101, in my opinion.
Double Edit: wow there’s a lot of commas in this post