Hi,
I'm drawing closer to doing my event and so wanted som opinions.
For the 1st time I've tarpaulined the car port in and this is what it looks like (daylight):
I intend to put the projector just inside the garage at the one end (where the camera is in the photo) then project the image onto the roof somewhere down the other end - exact angle will depend on the logistics of keeping it above everyone's heads (I intend a small exclusion zone).
Total length of the car port is 27 feet from memory.
Obvious dangers are:
1. Bulk head lights - I intend to cover these with cloth to stop reflections as they won't be on anyway. I intend to use weak portable lights and reflected light from the laser to light the carport rather than strong lighting.
2. Polycarbonate roof - can't do much about this but I doubt much will reflect back down and they're smoked polcarb and the beams will help interrupt some reflection
3. Tarpaulin sheeting itself - its made of polyester type plastic material and is quite shiny. It does reflect light in the day. I wondering if this will be a problem if the lowest part of the projection passes onto it at the far end (ladder end in the picture). Do you think being woven and uneven, any reflection will be diffuse enough not to matter? Do you also think that with the projector pointing upwards, most reflection will go upwards anyway even though it might be on the down stroke of a pattern? My projector appears not to put out any concentrated pencil beams in auto mode anyway. The nearest it comes is when it shrinks the pattern down to near a point, but this happens quickly and in the projection centre which shouldn't be on the tarp anyway - it will be centerd on the roof, probably I'm guessing on the beam between the 2 visible bulk head lights. The exact centre point will be determined obviously by the extent of the downwards sweep and also the angle of the beams up from the projector - I need to keep the exclusion zone small and reasonable so will need either a steeper angle or higher mounted projector to ensure this. However, adjustments there will affect where I centre it on the top, and thus in turn how far towards / onto the end tarp the downward sweep reaches.
Finally, I have tested the tarp for flame retardeness. It doesn't burn easily even with a naked flame - it tends just to melt, and the one time I got it to burn, it only had a small weak flame that extinguished after a few seconds when it met the molten blob that formed behind it.
Reckon this will be safe?