The Luxor Sky Beam actually consists of 39 individual xenon lights with 7,000-watt bulbs. Collectively, the lamps sit in a room about 50 feet below the very tip of the pyramid. The room looks, surprisingly, like the backstage area of a theater with lighting panels, lights and ladders everywhere. And the switch that turns them all on? They’re actually on a timer, programmed to light up right around dusk and shut off before dawn.
But for our actual requirement of creating a vertical pillar of beam - visibility is hugely dependent upon general lighting, Unified Glare Rating (UGR) in the viewing area.
Currently visible only for 1.5 km for vertical beam.
Also learnt that if only we place the source of light, at higher plane then the beam appears to be vertical from different places, else it's a different beam angle for different view points.
One misunderstanding was the beam divergence rating , where rated value is 1 mrad at full angle.
But for a single beam - divergence was much lower , which explains visibility at 10 km distance.
As we need thicker beam, currently exploring option of beam expander lens.
Opiphir.com had some basic info
Edmund optics seem to be having something specific to suit our needs.
Please do give your inputs/ suggestions..