May I ask the FormLabs community for what teams are using for a photodiode power sensor that is capable of measuring 405nm wavelength light.
Thanks everyone for your guidance!
I have one of these: Chitu Systems Digital UV Light Meter Tool for 405nm Standard Photopolymer LCD/DLP/SLA Resin 3D Printers : Amazon.ca: Industrial & Scientific
There are obviously more accurate and expensive sensors but if you’re taking solely relative measurements its worked well.