I've kept birds for years and have never offered them special lighting. When the weather is good I will place their cage next to an open (screened) window, but I don't have any special bulbs for them or anything. I've read that using the wrong bulb could damage their eyes. What are the benefits of a special bird light, aside from vitamin D, which they can get from their food? And which lights are safe for them? I live in an area where opening windows is not an option for good portions of the year...