LearnLight by Flappit.com allows you to compare any of 5 included spectral images. Plot their visible light intensity, transmittance, and absorbance. Learn about visible light, spectrometry, spectroscopy, and spectrophotometry. Set one image as your Reference and another as your Sample. Observe how altering width (in pixels) of a given selection changes the resulting data. Compare the relative intensities of blue, red, and green light energy. What is the relationship between transmittance and absorbance?