UV-Index-Solar Radiation-Lux Brightness-Air Quality Index for Grand Rapids, MI
No Cautions Required
No advisory required . Safe for all skin types though be-aware of sunlight when sun approaches low horizon,wear sunglasses.
Solar Radiation Poor
When the sun is near the horizon,overcast,obscured or darkness hours this will prevent Solar Energy replenishment.
Good Considered Satisfactory
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”.