Led Grow LED Grow Light Spectrum & Light Science 2

Question 1

What is the DLI (Daily Light Integral) measurement unit?

Accepted Answer

mol/m²/day

Answer

DLI is measured in mol/m²/day, representing the total number of photons received by a plant surface over a full day.

Question 2

Full-spectrum LED grow lights are designed to mimic which natural light source?

Accepted Answer

Sunlight

Answer

Full-spectrum LEDs are engineered to replicate the broad wavelength range of natural sunlight across the visible spectrum.

Question 3

What wavelength range is considered UV light that can increase terpene production in cannabis?

Accepted Answer

315-400 nm (UVA)

Answer

UVA light (315-400 nm) can stimulate terpene and resin production in cannabis plants as a stress response.

Question 4

Green light makes up a portion of full-spectrum LEDs primarily because:

Accepted Answer

It improves canopy penetration and supports lower leaf photosynthesis

Answer

Green light penetrates deeper into the plant canopy than blue or red, supporting photosynthesis in lower and inner leaves.

Question 5

Which term describes the efficiency of an LED grow light in converting electrical watts to PAR output?

Accepted Answer

PPE (Photosynthetic Photon Efficacy)

Answer

PPE (Photosynthetic Photon Efficacy) measures how many µmol of PAR photons are produced per watt of electricity consumed.

Led Grow Practice Test