I expose mine for 12 mins and it works great, it's a 10Whatt UV LED lame. Might be waYYYYYYY tooo long for most but works perfectly for my little home setup.
Hey, yes. My time changes throughout the year too because I have a metal halide bulb, so it's best to measure light units. Not a lot of people have the ability to do that though so everyone will have different times.
