I forgot the most important thing about my sewing room: LIGHTING.
We mounted two 2-tube units of 4' long DAY SPECTRUM LIGHTING tubes into industrial/ commercial lighting bases - the kind you'd likely see in a garage. We never considered a type of cover for the lighting because anything we auditioned changed the color to where it was no longer "clean." I can work for hours in the room without eye fatigue or color-matching gaffes due to off-color lighting.
The sales person at Home Depot said that if I bought FULL SPECTRUM lighting that it would work like the sun does and I would likely get sunburned. Since he had full-spectrum products - at the same price as the DAY SPECTRUM - I bought his explanation and the day spectrum lighting. I cannot tell you what a HUGE difference the day spectrum lighting has made after years of "other" lighting, and the 4' long tube lighting does an amazing job of lighting the room fully without theatrical effects.