The Vernier light sensors can not be used to measure PAR, photosynthetically active radiation. They do not have the right spectral response nor are they calibrated correctly.
If you want to measure PAR you should consider purchasing a Vernier PAR sen...
A mini UV Lamp can be purchased from Wards Natural Science, wardsci.com. The lightweight unit contains a six-inch tube that emits 365 nm longwave UV. It is composed on high-impact plastic and has an attached lanyard for easy handling. Four AA batter...