The projector should be arranged to prevent beams from going into airspace. Some beams may go over the roof of a house, or may go through gaps in tree foliage. It can be difficult to terminate all of the beams on such a device. federal law that would prevent possession of a laser garden light, or use of it when terminated as described above. Thus, even a low-flying helicopter could not intercept the beams. A 1 mW beam normally would not be a significant hazard to an aircraft.Ģ) Aircraft cannot safely travel between the laser source and the termination surface (house or trees). legal limit for a laser pointer is 5 milliwatts. There are two main aspects to consider:ġ) The power of any given laser beam from the device is said to be less than 1 milliwatt. In the U.S., use of a laser garden light is legal and safe as long as the beams are terminated on a surface such as a house, or trees with dense foliage. The following is from a letter we provided to a person with a garden laser projector that had beams of less than 1 milliwatt. Federal Aviation Administration put out a news release warning homeowners to keep laser light displays on the house and not in the sky. We heard of one person who put a projector in a young child’s room this is not recommended. Star projectors should be kept away from children. For the most part, the individual beams appear to be safe for brief, accidental exposure to eyes as long as a person does not deliberately stare into the beams. They use a diffraction grating to split up a beam into multiple dots or shapes. Since then, numerous companies have been selling these home laser projectors. Both photos from the Star Shower website. It screws into a stake that is placed in the ground for outdoor use.Ī home densely covered with laser “stars” from multiple Star Shower projectors. The cost was around USD $40 for a “ Star Shower” projector, heavily advertised for outdoor Christmas lighting. In the fall of 2015, low-cost laser “star” projectors became widely available. Tips for using garden/holiday “star” projectors A comprehensive resource for safe and responsible laser use
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