UV-Index-Solar Radiation-Lux Brightness-Air Quality Index for Douglas, MI
No Caution Required
No cautions required.The sun may be low on the horizon,obscured or below the horizon due to darkness hours.
Solar Radiation Poor
When the sun is near the horizon,overcast,obscured or darkness hours this will prevent Solar Energy replenishment.
Good Considered Satisfactory
Grand Rapids, Michigan, USA
Measures the approximate human eye response to light under a variety of lighting conditions.The total amount of all the light measured is known as the “luminous flux”.