Hoppy I'm thinking about ordering one of these as is. I'm gonna take apart the sensor and silicone like you showed to waterproof. Then using the lux meter reading lux, I then divide whatever number it says by 78? Correct? This cheap diy stuff can get confusing
Yes, that's correct. You use the meter as it is designed to be used, and it measures in lux. Divide the lux value by 78, or for some lights the number to use is as low as 70, and you get about the right PAR reading.
Don't forget how hard it is to get the sensor completely waterproof. I was successful once, but other times it would eventually seep a little water in, and stop working until I dried it out, not easy to do. This was so frustrating to me that I finally decided that it would be best for me to just use it by propping my light across a couple of chairs, and measuring the lux at the same distance from the light as the substrate was, then divide by 78 (I finally switched to 70 as the divisor, but I forget why