This weekend, I had the opportunity to meet a fellow figurative painter in the field by the name of Tim Jahn who is a great guy.  Tim and I spoke at length about painting approaches, techniques, etc. and I discovered while talking to him a very useful approach to studio lighting which is similliar to what another good friend of mine uses in his studio.   Essentially, I have wrestled with color shifting issues while painting during the day with cool lighting coming through my skylights and then moving into the evening where my track lighting takes on a very yellow cast.  He told me about Chroma 50 bulbs which are a full spectrum bulb that evens out your lighting results throughout the day.   Here's the link below he gave me which you can find the bulbs.  They are listed under their florescent selection and I would suggest the 4' bulbs if you can get them.  www.buylighting.com

-W.S.