Build Your Own Helio-STELLA

The Helio-STELLA is a diy handheld Heliophysics instrument. It requires no 3D printing or soldering to be able to complete.

Helio-STELLA measures the spectrum of visible light in 8 channels, from violet to red, plus UVA and total brightness in lux units. 

Specifically designed for looking upward to measure solar radiation, Helio-STELLA is useful for characterizing sunlight colors and intensities.

How does the light change at sunset? Is it different from sunrise?

How does the light change as the sun goes behind the moon during an eclipse?

* optional 3D printed housing shown

* Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.