Led Grow Light Guide 4

Question 1

What does the abbreviation 'PAR' stand for?

Accepted Answer

Photosynthetically Active Radiation

Answer

PAR refers to light in the 400-700 nm range that plants use for photosynthesis.

Question 2

Which measurement is misleading for evaluating grow lights because it reflects human eye sensitivity?

Accepted Answer

Lumens/Lux

Answer

Lumens and lux are weighted to human vision and do not reflect plant-usable light.

Question 3

Why do many LED grow lights appear pinkish or purple?

Accepted Answer

They blend separate red and blue diodes

Answer

Mixing dedicated red and blue diodes produces a characteristic purple-pink glow.

Question 4

What is the benefit of light uniformity (even coverage) across the grow area?

Accepted Answer

Consistent growth and yield across all plants

Answer

Even light distribution avoids weak edge plants and promotes uniform growth.

Question 5

Increasing CO2 levels in a sealed grow room allows plants to use what?

Accepted Answer

Higher light intensities effectively

Answer

Elevated CO2 raises the light saturation point so plants benefit from higher intensity.

Led Grow Practice Test