Uncovering A Problem With The Lumen
Lighting Science
Lighting History
100
Area of our vision comprised of only cones and no rods
What is the fovea?
100
Production of this chemical that helps us sleep is blocked by short wavelength (blue) light entering our eyes
What is melatonin?
200
The color you will see on a white surface after you stare at a red surface for a while
What is cyan?
300
The function that translates radiometric energy into photopic values
-What is V(λ)/luminous efficiency function/photopic luminosity function?
300
Wavelength of light that most sea animals can see better than us
What is blue/UV light?
Light between the wavelengths of 450-495 nm travel the furthest in water before being absorbed, making it the most available color of light in the ocean.
300
This complex industry standard, backed by IES and spearheaded by Kevin Houser and his former students, was developed over 18 months to combat a lagging CIE-backed color rendering index.
What is TM-30?
400
The type of cone not present in our center of vision
What is the S cone/blue cone?
Our center of vision is tritanopic. This was observed in 1894 by a German scientist, but was forgotten about it until 1945, when two British scientists independently discovered it and published their findings.
400
A large range of wavelengths removed from light sources in the transition from incandescent light to LEDs
What is infrared light?
500
The problem with the lumen
The blue cone is very under-represented in V(λ)
500
This color can rarely flash on the horizon when the sun sets over the ocean
What is green?
500
The French name of the CIE
What is the Commission Internationale de l'Éclairage