Interpretation of Data

 I suspect the reason orange and green had the best results because red and blue may have lessened intensity. For example, the blue filter I used may of obstructed the intensity of the blue light passing through whereas the green filter would of allowed blue and yellow light to pass through at a greater intensity.
 There could of been error in my sample, as well. There is a possibility that my samples did not represent the actual algae density of the PBR as a whole.