Led Grow Light Key Features 5

Question 1

A grower notices stretched, leggy seedlings under their LED. Which light feature is most likely insufficient?

Accepted Answer

Adequate intensity (PPFD) and blue spectrum

Answer

Low intensity and lack of blue light cause plants to stretch toward the source.

Question 2

For a 4x4 ft flowering tent, why does coverage footprint matter when choosing a fixture?

Accepted Answer

It ensures uniform PPFD across the whole canopy

Answer

A footprint matched to the tent avoids dim edges and uneven flowering.

Question 3

Which combination of specs would indicate the most energy-efficient, high-output fixture?

Accepted Answer

High PPF and high efficacy (μmol/J)

Answer

High total photon output paired with high efficacy means strong light at low energy cost.

Question 4

A spectrum-tunable light with separate veg and bloom channels lets a grower do what?

Accepted Answer

Shift the spectrum to match the growth stage

Answer

Adjustable channels let growers favor blue for veg and red/far-red for bloom.

Question 5

Why might a grower avoid relying on lux meters to set up a grow light?

Accepted Answer

Lux measures human-visible light, not plant-usable PAR

Answer

Lux is weighted to human eye sensitivity and ignores key plant wavelengths, making it unreliable for plants.

Led Grow Practice Test