When we sat down with lighting expert Gary Gordon, he pointed out 3 common issues in homes and offices:

1. The wrong quantity of light.
2. The space is over-fixtured.
3. There is too much glare.
Here are some important concepts to be aware of before designing your next space:

 


 

Watts vs Lumens

Watts measure power consumption. Lumens measure brightness.

After phasing out power-hungry incandescent bulbs, the two popular choices are compact fluorescent (CFL) and light-emitting diode (LED.) LEDs can put out more lumens using fewer watts. They also last longer and emit less heat. 

 


 

Color Temperature

The warmness or coolness of white light, measured in Kelvin.
  • Warm Light: Anything below 3,500K begins to have a yellowish appearance. This has a calming effect, likely due to our evolutionary attraction to fire.
  • Cool light: Anything above 3,500K begins to have a bluish appearance. Great for focus but terrible for rest, as it controls your circadian clock by reducing melatonin.
CFLs used to provide a warmer, more natural temperature than LED. This is no longer the case as LEDs can be tuned to simulate CFLs, and even adjust throughout the day for a natural feel at all times. 

 


 

Illuminance vs Luminance

Illuminance measures how much light falls onto a surface. Luminance measures how brightly that light reflects off of the surface.

Lighting designers measure lumens per square foot (often referred to as lux or foot-candles) to determine ideal brightness around a room. Ideal illuminance is determined by a space’s purpose, while attention to luminance can help avoid glare and its debilitating effects. 

 


 

Color Rendering

How accurately a light reveals the various colors around the room. Comparing how colors are perceived when illuminated by your light source versus a natural light source like the sun, accuracy is rated on a scale of 1 – 100. This is called the Color Rendering Index (CRI.)

Both fluorescent and LED bulbs vary in CRI from low 60s to high 90s. Lights closer to 60 can appear different from each other even out of the same box. We recommend using lights with a CRI above 90.

 


 

Our Visit to Ketra

With dozens of patents and a remarkable approach to LED lighting, we wanted to check out Ketra as soon as possible to see what all the hype was about. Watch the video to see our experience.

 


 

Other Questions?

Get in touch with us and we’ll be happy to help.