I'm working on a skylit warehouse, around 700k sf. We're just barely non-compliant using Option 2 Prescriptive (something like 2.8% skylight area), but spot checks show that we'd be compliant under Option 3 Measurement. So, at one measurement every 10 feet, that's around 7700 measurements. Wow! Has anyone had success proposing an alternative method of sampling light levels? It kills me that I know the project is compliant, but I can't prove it via Option 3.