Specifically, I would like to determine the concentration of Marinobacter hydrocarbonoclasticus. Just like a UV-Vis, I will be using a GL55 photoresistor (as shown in the image attached) to calibrate the concentration of this bacteria by using a laser source. The choice I have available here is either 532nm (green) or 630nm (red) laser. I have found that 532nm is more likely to cause photobleaching to the photoresistor in the long run, since it has a higher photon energy than 630nm, however 532nm can be more sensitive to determine bacteria in a low concentration range. Hence, I would kindly like to seek advice from someone who has experience in developing a system involving LDR coupled with a laser. Thanks in advance!