Thanks for the information.
Cons:
1) A large and constant consumption.
2) Change the colors of the painting in the photo. This is explained by the fact that incandescent lamps have a yellowish emission spectrum with a color temperature of approximately 2700-2800 degrees Kelvin (there is such a term). For comparison, the source of natural light - the star called the sun - provides light at a color temperature of 6000 degrees Kelvin. I do not remember, but a strong difference exists. In support of my thesis I will say that any artist understands the difference in the work with natural and artificial light.
This is not a problem for black and white photography. Also, change the color is not important for the Soviet example, when the quality of printing has been awful. In Soviet printing color still changed beyond recognition.
3) And most importantly, all the recommendations for Dummies "are advised to withstand an angle of approximately 45 degrees. In my experience, this angle is only under certain conditions. And is associated with the size of the picture, or rather its width. If you take a picture of a small size - this advice is good, but it is worth to cross for a meter or two ....
So, do not guessed!
Make-quality images that can be attributed to the printers will not work.