Best sort of artificial light for indoor painting
At one time, people would get plant grow lights that mimicked sunlight.  Those were pretty much limited to fluorescent tubes that went in "shoplight" type fixtures.  Those are still available, but "daylight" bulbs are now also readily available in most bulb styles (shape and base) in fluorescent tubes, compact fluorescent, and LED, as a standard choice for color spectrum.  So you can get "daylight" illumination in pretty much any fixture or lamp you're using to light your work.  Note, though, that you can't go by just a "daylight" designation, as this might actually be bluer than sunlight, so yellows won't be accurate.

Bulbs are labeled in a number of different ways.  There are descriptive terms for ranges of color temperature, roughly:


warm white/soft white: 2700K-3000K (yellowish, like incandescent)  
cool white/bright white: 3500K-4100K (white)
roughly 3500K-3800K is sometimes labeled "neutral white" because it lacks a color cast. 
daylight: 5000K-6500K (bluish)
5000K-5765K is sometimes labeled "full spectrum" because it most closely resembles sunlight; 6500K is more blue/less yellow than actual sunlight.


To get the most accurate color, you might want to use neutral white.  To get colors the most similar to sunlight, look for "full spectrum", or "daylight" close to 5000K.  Going by the color temperature will be a more accurate selection than using the descriptive terms.

You can also look at the Color Rendering Index or CRI number.  It's a scale that goes from 0-100 and reflects the ability to show true colors across the spectrum.  The closer you get to 100, the more accurate colors will be.