Determining the light levels in your shop is an important part of ensuring that your customers have a pleasant shopping experience. If you have limited natural light or operate at night, you can ...

In my recent post about calculating the speed of light, I mentioned Ole Roemer's calculation in 1676. The basic idea uses the orbit of one of Jupiter's moons. The orbital period is constant, but there ...

It’s no secret that lighting designers must wear many hats, but according to the Illuminating Engineering Society of North America (IESNA), the actual number of those hats might surprise you. A review ...

Joel Spahn is a Software Developer for Lighting Analysts, Inc. and Lead Developer of ElumTools, a lighting calculation add-in for Autodesk® Revit®. He is also author of Lighting Analysts’ Flash-based ...

Facility and building lighting design is a technically complex and fundamental component of building construction requiring mastery of varied and rapidly evolving product technologies. A knowledgeable ...

In the week after Easter, we had a lot of old Peeps lying around. No one seemed that interested in eating them, so we used them to measure the speed of light. For centuries the speed of light was an ...