Lighting is more than just fluorescent or halogen. Light has colour and quality. The better the quality and choosing the correct colour means that the print or artwork we look at is viewed correctly. If the the light is too warm we see red and oranges far too saturated compared to the blues and greens. Often the light is a poor quality, think of the way office fluorescent tubes make people look bit grey/green, not a good look! If we look bad the print or artwork will look bad as well.
For graphic professionals there are ISO standards on what sort of light should be used and it can be measured and tested to see if it is correct, normally D50. For galleries we can help specify the tubes or LED lighting to best match northern light and make the viewing of the artwork as close to how the artist saw the colours.