How bright is 1200 mcd in watts?

Answer 1

You can use the calculator at http://led.linear1.org/lumen.wiz to convert to lumens if this makes the value any easier to understand.

I'm assuming you are asking about the rating of an LED - if so, you will also need the beam angle. The Candela rating should be the average over this beam - many LED manufacturers quote the maximum instead to try and make their products sound better. Also, 7cd (= 7000mcd) over 120 degrees would be a much brighter LED than 7cd over 15 degrees - unless of course you just wanted to illuminate a small area and were not using a lens or other optical system to concentrate the beam.

Answer 2

To convert luminous intensity (measured in millicandela, mcd) to power (measured in watts), you need to know the luminous efficacy of the light source. The conversion depends on the light source and its efficiency in converting electrical power to luminous flux. Without this additional information, it is not possible to directly convert 1200 mcd to watts.

Answer 3

0.12w