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

Too much heat-sink mass

Answer

An overly high IP rating

Answer

A power factor that is too high

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

It sets the color temperature

Answer

It determines the IP rating

Answer

It fixes the power factor

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 wattage and low efficacy

Answer

High lumens and low PPF

Answer

High color temperature only

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

Increase the IP rating mid-grow

Answer

Lower the L70 lifespan

Answer

Eliminate the need for dimming

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 meters overheat the LEDs

Answer

Lux only works outdoors

Answer

Lux measures only far-red

Question 6

Mounting a fixture too close to the canopy at full intensity most commonly causes what?

Accepted Answer

Light burn / bleaching on top leaves

Answer

Increased far-red output

Answer

A higher power factor

Answer

Improved DLI accuracy

Question 7

What advantage does a quiet, fanless LED offer in a small grow space?

Accepted Answer

Less noise and fewer mechanical failure points

Answer

Higher UV-C output

Answer

Automatic nutrient dosing

Answer

A wider color temperature range