Canadian Garden Supply says.....
Every grower has at least one green light source in their room, or in their toolkit. Most pros have one of each kind of green light product.
A good example is this green flashlight that won't disturb your plants night-time sleep. Green light just bounces right off your plants.
For a quick check at night, have this flashlight in your pocket so you can do some of your room work during your plants dark cycle. This makes it more comfortable than working under hot lights!
Has 9 green LEDs that last 50,000+ hours