Hi, my first thread here...
For an upcoming event in my community, where the public is encouraged to decorate their gardens with various light effects, I have got the idea to make a spotlight pointing straight up from my backyard. It shall be presenting a beam of light that is clearly visible for by-passers at a distance (say up to 500-1000 meters). Also, it should be safe to have it illuminated for 3-4 hours unattended.
Because of a limited budget, I first thought of just putting out a 1 kW PAR64 VNSP halogen spotlight but it has a beam divergence of 12° and 9° in X and Y, respectively, and I'm not sure if that it will be percieved as a "beam of light" fom a distance, also, the warmer output from the halogen is not as eye-catching as the blue light of an arc-based lamp.
So, since the reflector is a major cost in such a project, I wonder if it could be worthwhile scavenging the parabolic reflector from a VNSP PAR64 lamp and combining it with a short arc lamp? I'm kind of hoping that the reflector is well made and that the 12° and 9° divergences are due to the filament size.
Anyone have any thoughts about this approach?
Also - any tips on how to make the spotlight stable and safe for extended outdoor operation are appreciated.