Ive had the light for about a month now , its really easy you just get a small screwdriver , you stick some tape to it aiming at the number for example 100 and then you rotate so you can see where the tape is lol this is some prehistoric way to do it but it works ! I saw that video with the volt meter , i might get one in the future but my way works well too ! Of course maybe not as accurate but its fine for me , in the end they’re going back to 100% so its fine ! I use an extractor fan , its a bit noisy and i have my tent in the hallway , so when i close my bedroom door i dont hear anything ! I suggest you get a better fan for extraction , i use pc fans to cool lights sometimes but thats it ! You’re going to have to use a carbon filter later on , and pc fans wont have enough power to push through the filter