Useful articles http://www.ledsmagazine.com/articles/print/volume-6/issue-2/features/led-design-forum-avoiding-thermal-runaway-when-driving-multiple-led-strings-magazine.html

How Much Heat Is Created LEDs are not 100% efficient.  Much of the power running through an LED is output as heat and needs to be dissipated. Good high power LED's, such as some Cree XLamp LEDs are over 40 or 50% efficient – that is, under normal operating conditions, approximately 50% to 60% of the input power is […]

When a black object such as a piece of iron is heated up it changes colour depending on the temperature that it is heated to. It turns out that this range of colors is very useful for describing the colour tint of white light. You can actually determine the temperature of hot iron by measuring its […]

The responsivity of the human eye is not linear.  In particular it is more sensitive to green wavelengths, so green LEDs with similar intensities to other colours will always appear brighter. However when designing red, green & blue LED lighting systems remember that these 3 types of LEDs are quite different. You typically electrically need […]