3d Luminaire models

Hello,

The discussion of Photometric lights have come up recently; which has brought me to asking a question.

Other than ERCO, where is everyone downloading the actual luminaire mopdels from. Ive been using the lightscape luminaire blocks while using Lightscape. Now that I have moved to Vray, what are the options?

Is it a simple export the luminaires, modeling them? Ive read that Viz has some standard luminaire models in Viz. Is this true?

Thank you in advance for any help.

Arkitec