Vray light Lumens

[andybot_cg]

Shoot. I'd love to have an answer to light units and intensity too. I've been using vray 2.0 standalone (with Blender) and the default units are 1m for certain. I was really perplexed that I had to increase the lumens by a factor of 100 (for example) to get what would be correct light levels for the camera exposure level. -
I've taken to just using default units for lighting, I get the lighting effects I want.

Edit - OK, I did a test scene based on an actual photo, and, um, it works. Per my comments, I've been having trouble with spot lights and IES lights, it may be that those kinds of lighting calculate differently.

[Macker]

I've been working with "real world" settings within VRay for quite some time now and haven't really got any results that differ from what i'd get if I were to use a real camera. I tend to use 1800 lumens as a standard for a 100w incandesent bulb and everything is fine depending on how I have my camera exposure set up.

[andybot_cg]

Just so I could get my head around it, I did a real-world test. I took a photo, and then set my vray physical camera exposure based on it, and modeled everything true to life. The bulb in the lamp is 1200 lumens, and I used a point light (with a radius approximating the bulb)... I think it's fair to say it's a reasonable simulacrum.

The camera settings are: f3.5, iso400, 1/13s, 75mm lens.