Bedside table and lighting: the right size

Southern Living says the bedside table should be as high as the mattress top and the sconce at eye level

http://www.southernliving.com/m/home-garden/decorating/bedside-table/table-height

And Tidbits and Twine say the ideal height for a bedside table is 61-68 cm and the bottom of the shade of a wall sconce should be about 50 cm from the top of the mattress...

http://www.tidbitsandtwine.com/my-secret-cheat-sheet-of-measurements/

I wonder if this applies to canopy beds as well, they take up a lot of space visually.

I also read that wall sconces should be just above shoulder height.