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This gobo light projector uses found objects, store bought lighting parts and one (1) custom fabricated armature. You can order online or make your own gobos that pop into this apparatus to project illuminated images at various sizes. We custom designed  cloud and grassy field gobo to be dreamy. This sculptural lighting assembly is decorative and interactive.

Step 1: Diagrammatic Assembly

Picture of Diagrammatic Assembly
Review the overall assembly of parts that you will need to find, make and buy. We chose to repurpose a hard cigar box for the base because it had a functioning lid that made wiring easy and has a nice wallpaper-like pattern.
 
nikosb8 months ago

Is it possible to adjust the projection angle (narrow to wide) to control the size of the projected image (small to large)? If yes how can that be done?

BobF10 nikosb1 month ago

It's possible, but somewhat complicated. Basically what you need to do is construct a zoom lens by adding another (at least) two lenses, one convex and one concave, into the light path. By adjusting the relative positions of the lenses you can control the zoom (expansion) and focus.

Unless you're really into the DIY aspect for philosophical reasons, you're probably better off just buying a slide projector that already has a zoom lens, though (l8nite was correct ... a gobo is basically a single "slide", usually made of metal or tempered glass so it can withstand very bright/hot lights). You may be able to find one cheap at your local Goodwill or other thrift store.

With regard to making gobos ... if you use an LED light source and the gobo is not practically on top of it, it's probably cool enough at the gobo position for you to print your own gobos onto transparency film. (Try holding your hand a few feet from the lamp, and slowly bringing it closer until it either becomes uncomfortably warm or your hand is at the distance from the light source where the gobo would normally be. If you can stand to hold your hand there for a couple of minutes, you should be able to use transparency film.) Trying to do that with an incandescent light source of any significant brightness will likely just melt the plastic (there are gobo holders designed to let you use transparency film even in, say, a 575 watt theatrical fixture, but they involve fan cooling and a special IR-reflective barrier placed before the transparency, and the transparencies still don't usually last more than a few dozen hours at most).

fujofly3 years ago
Gobo means "goes before optics". The lighting template (plastic, metal, glass) that holds the design you want to project.
l8nite4 years ago
I have no idea what a gobo is and even after a quick google search Im still not sure, Kind of like a single slide projector ? neat project though and it does have a sculpturel look to it
A gobo is a thin piece of metal with a design cut out. When placed in front of a light source, the image is then projected. They are most often used in theatrical applications, but also becoming more commonplace at special events and even for advertising. Try googling Rosco or Gam gobos....those are just two of many many brands. Also, you can make your own with those aluminum pie tins - though buying them is far far easier!
Nick Thomas Design (author) 4 years ago
Thanks for the feedback. We will update the steps with images to clarify the "gobo" component. You are correct in that the gobo is like an individual slide, which is placed directly in front of the MR-16 light source.