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