To reproduce my paintings, I use 2 construction halogen lamps (300 W). In front of those, I’ve placed linear polarizing filters at a distance of 40 cm. My camera is a canon 6D with a 100 mm macro lens, or a Fuji xt with 60 mm macrolens with a circulair polarizing filter in front of the lens.
I shoot in raw and develop in Photoshop.
The set up for the lights may be cheap and obsolete, but it works perfect. No glare or whatsoever (my paintings have a glossy varnish and are approx 60x90 cm, smaller or larger).
For viewing and color corrections if needed after shooting, I use Norm studiolight 5000°K.
My computer is also callibrated at 5000°K. This way I see the colors of the painting correctly on the screen if I need to tweak colors.
For very large reproductions, I make 3 photos and stitch them in Photoshop. That results in files of more than 50Mb. But mostly one 16-20 Mb shot is large enough.
I don’t use soft boxes for shooting my paintings because I prefer the direct light which is more crispy (detail).