LEP Application

Study on the Lighting Effect of Different Light Sources on Plant Growth

——Netherlands Agricultural University Full Spectrum Plant Lighting Research Project

Experimental Overview

        4 experimental sites:Netherlands, greenhouse, winter;

        Experiment time:Starting from December 7th, 2015;

        4 types of light sources:High pressure sodium lamp (HPS)LED；Ceramic metal halide lamp, plasma light source (LEP);

        5 types of crops:Tomatoes, rapeseed, lettuce, radish, roses;

        Research from various perspectives:Durability, composition, growth, quality, health, nutritional content, yield, rhizomes, planting, initial stage, color, white sugar content, fruit, flowering period, taste, impact, etc.

4 sets of light sources with equivalent power

Non full spectrum light source——

• High pressure sodium lamp: 1035W, CRI 24

• LED: Plant Growth Light 1100W

Full spectrum light source——

• Plasma lamp: 4 * 270W, CRI 94

• Ceramic metal halide lamp: 2 * 760W, CRI>90

On site effect perception

• Plasma light sources do not have orange and pink colors like HPS/LED;

• Plasma light is softer and feels more comfortable；

• Using LED requires additional heating equipment.

Results after 4 days

• Most lettuce under full spectrum appears red.

• Under plasma and ceramic metal halide lamps, lettuce appears more red.

• Under LED light, there is only some red color, while lettuce under sodium light has almost no red color.

The result after 2 weeks

• Growth is better under full spectrum and best under plasma.

All crops

• It grows vigorously under plasma and ceramic metal halide lamps.

romaine lettuce

• Under plasma, the color is redder and grows more than under other light sources;

• Under LED, the color is normal, but the growth is less than that of plasma;

• The color under high-pressure sodium lamp is lighter and there is less growth.

Results after 3 weeks

• All crops grow best under full spectrum, with lettuce growing the best under plasma.

romaine lettuce

• The growth is best under full spectrum, and it is better under LED than under high-pressure sodium lamp;

• The colors under plasma are the most vibrant and the growth is the most vigorous, including appearance and other research projects.

radish

• The crops that grow best under full spectrum have results within a week.

rape

• The growth is best under full spectrum, and the flowers bloom the best.

Tomatoes

• The best growth occurs under full spectrum, and the flowers are about to bloom.