The Quantum sensor is to measure photosynthetically active radiation (PAR) ranging from
400 to 700nm waveband. The sensor comes in a very small housing and suitable for different applications:

* Plant science
* Meteorology
* Hydrology
* Horticulture
* Ecology
* Environmental science
* Others

The E90 Quantum sensor consists of a diffusion type of photodiode with filter in a housing.
The housing for Quantum sensor is well designed to provide a good cosine corrected response
to light coming from different angles. Besides, an interference filter is used to provide a sharp
cutoff at 700nm to reduce measuring error.