Standard DIN 5032 /7 (“Light Measurement Classifications for illuminance and brightness measurement instruments”) recognizes four classes of light meters based on their accuracy (not connected to the prices of the professional light sensors):
- class L: devices with highest accuracy - needed only in laboratories
- class A: devices with high precision
- class B: devices with a medium accuracy
- class C: devices with low accuracy
We recommend to take this standard as authority on light meter classification.