Tailored Spectrum LED Tape Light

Plant Light Requirements

Just as people need a certain amount of calories every day to grow and thrive, each type of plant needs a certain amount of light (photons). The total amount of light required each day for a particular plant’s optimum growth is its Daily Light Integral (DLI). Just as daily caloric needs can vary from person to person, the DLI for a plant species might range from 2-4 for some shade tolerant plants like ferns, to 20-50 or more for sun-loving plants like tomatoes.

A single meter of GroFlex in a 10cm diameter spiral configuration 10cm above a plant will yield a DLI of approximately 7.3 when run for 12 hours per day.

Typical DLI Values for Optimum Plant Growth

Daily DLI Range
Plant Species Minimum Good Max
Ferns, Ivy, Orchids, Bromeliads 2-3 4-5 6-10
Hosta, Impatiens, Cyclamens, Begonia, Lobelia 4-5 6-7 8-30
Fuchsia, Hydrangea, Lily, Poinsettia, Ficus 6-7 8-10 12-30
Peppers, Tomatoes, Vegetables 10-12 14-20 22-50

See expanded table here.

More About DLI

Plants absorb photons (particles of light) which provide the energy needed for photosynthesis. The DLI requirement for a plant species is usually a range of values. Most plants will grow with a DLI that is less than their preferred range, just more slowly and with smaller yields. With the exception of shade loving plants, most plants cannot receive too much light.

By determining the DLI range for the desired type of plants to be grown, the grow lighting configuration can be optimized to meet a plant’s needs. As noted above, in a 12 hour period GroFlex yields a DLI of approximately 7.3 per meter when placed 10cm above a plant. Adjust the length of your GroFlex installation in order to increase the DLI as needed.