Growing Lettuce With Grow Lights

Lettuce is a cornerstone ingredient. Fresh and tasty it’s the base of an easy delicious salad.
Lettuce grows well under grow lights and it’s easy to get started.

Lettuce Light Requirements

Lettuce plants will thrive under lights that provide:

12

16

 DLI 

DLI (Daily Light Integral) is how we measure amounts of “plant-useful” light. Once we know a plant’s DLI needs we can match it to the ideal grow light setup.

Day Length for Lettuce

Lettuce plants do best with a lights on for:

12

 hours 

Best Grow Lights for Lettuce

It takes a moderately powerful light to provide 12-16 DLI in a 12 hour period. The Bright Grow recommendations are:
  1. GE PAR38 balanced grow bulb. Hang the bulb 18 inches above the plant’s leaves. This will give you a circle of light 10 inches across that’s just the right amount of bright.
  2. The GE 24″ LED Fixture is also a decent bet. Hang the fixture just 5 inches above the plant’s leaf canopy. This will give a strip of optimal light 5 inches wide the length of the fixture.

Lettuce, like other leafy plants, will thrive under a balanced full-spectrum light.

Balanced full-spectrum lights provide roughly equal amount of red and blue wavelengths while still appearing white to our eyes.

High Output fluorescent or LED grow lights will both work well for growing Lettuce.

Temperature for Lettuce

Lettuce can handle higher temperatures as long as nighttimes are 10°F cooler.

Germination: 

50

 – 

80

°F 

Growth: 

60

 – 

70

°F 

Many plants germinate at lower temperatures and prefer more warmth for their growth. This is how plants have evolved — sprouting early in the spring when the days are cool and growing and producing as the days get longer and warmer.

Size of Lettuce Plants

Lettuce plants have shallow roots so your containers don’t need to be deep.
Typically grows 8

12

” tall

Does well in 4

6

” diameter containers

Lettuce Varieties

  • Oak Leaf
  • Lollo Rossa
  • Red Sails

Subscribe to our newsletter

Get exclusive guides to help your indoor garden thrive!