skylight value adjustment

[coromax]

Hello all,
my first posting here :-).
I´m currently evaluating the Corona demo with 3ds Max and must say, up until now I´m really excited about the ease of setting up renderings and the quality they have.
For an upcomming project I need to adjust the contribution of the ambient sky light preferably in lux messurements. I´ve only found the
skylight intensity spinner which only has unitless range of 0-1000. Can this be done in Corona? Is there a light measuring tool available?