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LIGHT AT NIGHT, OR NO LIGHT IN THE COWSHED?

Cattle have excellent night vision. You don't have to leave a light on for them.

That makes sense, in nature nobody stands with a lamp near the animals. With luck, the moonlight is the only light source.

During a "night barn check", it is useful for the farmer if there is night lighting.

He sees less in the dark than his cattle!

 

Cattle cannot perceive the color red.

A red light source with a light intensity <5 Lux is sufficient for the farmer to see. Cows experience this as dark.

Lux is the number of lumens per square meter (lx = lm / m²).