Instead of using "On 1 lux change" I'm using "log10 precision 3". It's another option under the lux reporting drop-down. See this post for more details.
When I use "On 1 lux change" the lux value doesn't change every 5 minutes as I'd expect it to. Whereas if I use "log10 precision 3" it does change every 5 minutes.
I'm using precision 3 because the highest lux I've seen inside my house is around 75. I believe the lower log precisions are for situations where you'll have higher lux values).
