A basement man cave is a great, secret, brooding spot — and many men have them. But the key to making this man cave spot work is in the lighting. Often basements don’t have adequate light because they don’t have windows. So if you’re going to spend a lot of time in this space, you’re going need to bring in as much inviting light as you can to make it cozy and comfortable.
Source:
http://nextluxury.com/home-design/basement-man-cave-design-ideas-for-men/