How many watts of light does a 12×14 bedroom need?
Working it out
12 x 14 ft is 15.6 square metres. A bedroom is comfortable at about 150 lux, which is 2,340 lumens, or 2,900 with a loss allowance. At 100 lumens per watt that is 29W in total.
How to split it
Four 9W downlights on the ceiling and two bedside lamps on their own switch. The split matters more than the total.
