The mass of a plant is directly related to its rate of photosynthesis, which is necessary for it to live and to grow. The equation of photosynthesis is: 6CO2 + 6H2O + Energy --> C6H12O6 + 6O2. In this case, energy is the light energy given off by the light bulb. Light energy travels in waves. Each color of light has a different wavelength which gives it a distinct color. The chart below shows the wavelengths of each color of light in order of shortest to longest.
Based on the graph and chart, there is a similarity in the order of color. For example, blue light has a shorter wavelength, and the plant with blue light had the highest photosynthetic rate. Red light had the longest wavelength, but the plant with red light had the second lowest photosynthetic rate. An interesting result is the white light as a control. White is a combination of all colors of light. This should be similar to the sun on the plants, yet it had the lowest photosynthetic rate. The graph follows the order of color spectrum on the chart: blue, green, yellow, and red. This shows that shorter wavelengths allows more energy to reach the plant for there to be a higher rate of photosynthesis. More photosynthesis means that the plant will be able to grow more, hence, having a greater mass.