Photometric Lights in VRay 1.5

[DrJan]

I'm working on an interior scene at the moment and I used some Photometric Linear lights. I had to set the intensity of these lights to 4000 lx at 2000cm to get a bit of a result, while in the past, 400 lx at 200cm was enough.

Am I missing something here? I'm using the VRay 1.5 settings for the Sun/Sky and Camera. Could it be that I have to check the "Use 3dsmax photometric scale" tickbox?

I've searched the forum but couldn't really find anything about it.

-edit-
Setup:
Max 9 32 bit, VRay 1.5

-edit 2-
The same goes for VRayLights by the way. A multiplier of 1.000.000 (!!!) starts to give a little result!

[vlado]

What is your system units scale? Are you using the V-Ray physical camera or a normal camera?

Best regards,
Vlado

[DrJan]

System Unit Scale is millimeters
Display Unit Scale is centimeters

We're using Physical Cameras

[vlado]

Then you should check the "Use 3dsmax photometric scale" option, yes. You may also need to adjust the camera parameters (f-stop, shutter speed, film ISO).

Best regards,
Vlado

[ern]

Then you should check the "Use 3dsmax photometric scale" option, yes. You may also need to adjust the camera parameters (f-stop, shutter speed, film ISO).

Best regards,
Vlado

Where can I find, this check box?... I use rc4.
another question is the sky intensity in rc4 correct?

Best regards
ern