The absorption coefficients of chloroplast of leaf mustard were measured by a spectrophotometer. The leaves were
collected from seven treatments with different lighting. The chlorophyll content was calculated following Arnon
equation. LEDs for filling the light source can increase the conduction of plants. Compared with other treatments,
Chlorophyll in the leaves got an higher concentration under the lamping of red LEDS to blue LEDS for 7:1 .