Are you set your latitude/longitude and time in the daylight system?
I'm still learning Mental Ray, but this is from my notes:
Quote:
Logarithmic Exposure Control:
[x] Active
[x] Process Background and Environment Maps
[x] Exterior Daylight
If the render is dark, the Physical Scale is probably off.
Physical Scale is measured in candela units.
The typical scene ranges from 80000 to 120000 candela units
This value should be set to the value of the brightest light source (MR Sun, target light, etc)
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If this is wrong info, please correct and advice - I'm still learning mental ray.