Light duration is one of the most important factors to determine the quality of a light. This is because it affects the plants growth, flowering and fruiting cycles. It also affects the light spectrum. You can have a very bright but short light duration. Or you can have a very weak but long light duration.
1.To determine the light duration, you need to know the following factors:
The intensity of the light source
The spectrum of the light
The amount of light emitted at any time
The color temperature of the light source
The size of the plant container
The light source