Led Grow Light Guide 5

Question 1

For the seedling/clone stage, what light intensity (PPFD) is generally recommended?

Accepted Answer

100-300 μmol/m²/s

Answer

1000-1500 μmol/m²/s

Answer

0 μmol/m²/s

Answer

5000 μmol/m²/s

Question 2

What is a common PPFD target for the flowering stage of high-light plants?

Accepted Answer

600-1000 μmol/m²/s

Answer

50-100 μmol/m²/s

Answer

0 μmol/m²/s

Answer

Exactly 10 μmol/m²/s

Question 3

What happens during 'light saturation' in plants?

Accepted Answer

Adding more light no longer increases photosynthesis

Answer

Plants double their growth instantly

Answer

Roots stop absorbing water

Answer

Light turns to heat in the soil only

Question 4

Why should you measure PPFD at multiple points under the fixture?

Accepted Answer

Intensity varies across the footprint, strongest at center

Answer

It is always identical everywhere

Answer

Only the corners matter

Answer

PPFD never changes with position

Question 5

What is the effect of UV-A light in small controlled amounts on some plants?

Accepted Answer

Can boost resin/trichome and protective compound production

Answer

Always kills the plant

Answer

Replaces the need for red light

Answer

Stops photosynthesis entirely

Question 6

When calculating coverage, the recommended wattage depends most on what factor?

Accepted Answer

Grow area size and plant light requirements

Answer

The wall paint color

Answer

The brand logo

Answer

The power cord length

Question 7

What is the benefit of reflective walls (like Mylar) in a grow tent?

Accepted Answer

They redirect stray light back to plants, improving efficiency

Answer

They absorb all light

Answer

They reduce PPFD at the canopy

Answer

They block the red spectrum