I am guessing you are talking about the underlays underneath the keys? If that is what you are asking, they don't glow at all. They are just a nice splash of color under the keys.
I have had several keyboards refurbished by Phosphorglow. I highly recommend him for restoration work. Some of the keyboards he has brought back to life are what most would consider "unrestorable" He literally can bring them back from the dead. http://phosphorglow.net Right now he is in the process of doing a lot of projects (including a new Model M controller and updating his website etc etc....).
If you want to see more pictures of the keyboards I have, you can always go to the link on the imgur site on my signature. There is a wealth of information here on geekhack, and don't feel intimidated or uncomfortable asking questions. There are a lot of nice and helpful people here.
I think he's still accepting orders (if that's what you were alluding to with the part about him being busy, if not nevermind me), I just sent him a dirty beat up SSK 1391472 that I got from Cindy a couple weeks ago. I'm having him do the underlay, add LEDs, restore and bolt mod, and controller replacement. So far, I'm really pleased with the experience, he's been really responsive and helpful even though I've been piling tons of questions on him! He even offered to proxy some stuff for me from Unicomp. I'm sure the SSK will return to me looking better than brand new! Perhaps I will write a review when it shows up, if I can keep myself from getting to distracted by the board itself!
I second that this is a great community, the best I've ever been a part of. It's great to have a wonderful hobby with an even more wonderful community behind it!
I was just wondering if the underlighting makes it more visible in a dark room.
I had seen the phosphorglow site before, that's where I learned about the annoying plastic rivets. Fortunately neither keyboard I've got so far have been extremely bad but I would think about sending him one if it was too much for me.
Most of my searches for model m info seem to end up here so i figured i'd join because it does seem like a great community!
In one of our e-mails, Phosphorglow mentioned to me that it was paint. I don't know if it's paint on the plate, or paint on a mat, or what. I asked him about durability, and he said it's quite durable.
It doesn't glow (although, that could be awesome, and go with his name!), it just looks cool. He offers it in quite a few colours, and all of the examples I've seen look great.