Light: Difference between revisions

 

== Measuring light intensity ==

The amount of photosynthetically reactive light ([[Light#PAR|PAR]]) can be measured using a PAR meter or a lux meter combined with the chart of the light's spectral power distribution (SPD).

A dedicated device may provide the most accurate results, but a cheaper alternative is to use a PPFD meter app on a smartphone. These apps use the phone's brightness sensor to find a lux value and ask the user to input the spectrum of the light they are using.