Here is a sample with Lux. Not with pointlight, but Lux-IBL (supported by the actual LuxPose converter). ** No other lightsource used**.  Just this single IBL.

Rendertime: 60 minutes with 4 cores (cheap AMD-Phenom), round about 200000 samples per second.

Model:
4 simple glasses (double-sided model) with standard Lux glass material, no special setups.
Table is a simple quad with a soft glossy.

Lux:
Tonemapping linear. I used Lens Effects and Noise Reduction from the Lux-GUI to get soft caustics and to smooth the glasses to the same level as the background image. Color-Space with Lux-GUI until all colors matched in a believable way. 

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