@binom If you film with a camera with a ntsc vertical reference rate of 59.95 hz you will see a beat note between the lights and the led lighting indicating it is not well filtered if at all. Many cheap led lights just have a capacitive current limiter and that's it. If you power them off of 50Hz you will see the flicker, if you get dimmable LED lights they will NOT have a filter. But I don't want to interfere with anyone's bragging rights.