I'm pretty heavily involved in the Quaker community, and have been since before I really became interested in the art world, so the first time I read about James Turell (a Quaker, himself) was on the builtin board outside my R.E. room. It was amazing to read about this world famous artist who had a connection to a community that I was a part of. Quakers believe in an "Inner light", so it was amazing as a kid to see a Quaker artist who literally using light as their medium.
In addition to displaying work in exhibitions like the piece in the image above, in 2001 Turell actually helped to design a meetinghouse with one of his light peices installed. Here's an acticle on that process, as well as an image and an except from an interview about his work and its relation to Quakerism:
Here's a really cool article on this whole situation (that will explain the mintaue better than I could), where 72 year old Turell says that though he is unaffiliated with the project, he's glad that Drake "F&%k's with him."