How are LEDs modeled in Photopia?
There are several types of LEDs on the market and different ways to model the different types. Some LEDs use a surface mounted chip sealed under a protective material that diffuses the light from the chip. These are generally referred to as “chip type” LEDs. Other LEDs encase the chip and sometimes a surrounding reflector inside of a clear bulb. These are referred to as LEDs with integrated optics. Standard Photopia lamp models can be made for the chip type LEDs and they accurately model the true behavior of the physical LED. However, if a standard Photopia lamp model is made for a LED with integrated optics then there are compromises in accuracy. Note that a “standard Photopia lamp model” is a model that utilizes the measured luminous intensity distribution in combination with luminous surfaces from which the rays emanate. In the case of a LED with integrated optics, the luminous surfaces in the model are those of the chip. Thus, all rays leave the chip with the measured intensity dis
