10 What is absorbed by the chlorophyll. 8 What is wavelength of blue light. Cool Infographic About Photosynthesis Plant Science Teaching Biology Teaching Science 7 What color of light is least effective in driving photosynthesis and why. . Thus measuring PAR is generally accepted by leading scientists currently as the best gauge for measuring how strongly a light will stimulate photosynthesis. Does The Color Of Light Affect Plant Growth. 6 What wavelength does chlorophyll b absorb. The best wavelengths of visible light for photosynthesis fall within the blue range 425450 nm and red range 600700 nm. There is a strong correlation between higher PAR levels and increased photosynthesis. Therefore the best light sources for photosynthesis should ideally emit light in the blue and red ranges. Chlorophyll A is the most extensive contained elements in the plants. The majority of green light is useful in photosynth...