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Vegetative seedlings use PAR light (light used for photosynthesis) that skews towards the blue spectrum.
Seedlings require a DLI value of approximately 6 to 10 mol/m2/day.
Light is measured using a device called a PAR meter.
The light that plants use for photosynthesis is called photosynthetically active radiation (PAR).
PAR light is visible light in a range of wavelength between 400 to 700 nm.
You need to know how much PAR light is actually hitting your plants. This is measured with PPFD (photosynthetic photon flux density).
You can measure PPFD using a PAR meter or a Smart phone app like Photone.
You can measure the PPFD to calculate DLI (daily light integral).
DLI = PPFD x Hours lights on x 0.0036
You can also observe your plants. If the plants are reaching and thin, they may need more light.
Seedlings require a DLI value of approximately 6 to 10 mol/m2/day.
You can use the DLI equation to calculate the recommended hours (Hours on = (DLI) / (PPFD x 0.0036)).