Lightguides – shape and performance – part 2
By Billy Kaldvee | In the last post we recommended to keep the distance between the LED and the light guide ten times smaller than the light guide diameter. To demonstrate why this is recommended for a high efficiency system, we once again do simulations on the 3 mm diameter circular light guide with the […]
Lightguides – shape and performance – part 1
By Billy Kaldvee | Have you ever done a mechanical design of a light guide without doing any optical simulations and wondered why the result looked as something you did not expect? In two posts we go through some of the basic aspects of light guide geometries and how they influence the perceived output. In […]
Etendue and Optical Invariants
By Olov von Hofsten and Simon Olin | “The possibilities of optics are endless” – you may have heard things like this and it sounds great and wonderful. Unfortunately it is not true – you have been told a lie. The possibilities of optics are NOT endless. In fact, it is very important to know […]
Simulating Luminance in Zemax
By Olov von Hofsten | Luminance is arguably the most important component to analyze when evaluating a lighting design since it answer the fundamental question, “What will it look like?”. In Zemax you get easily get the luminance for an entire surface, but not the local luminance or luminace maps. However, there are ways around [&h