Other Products
In addition to the 3M Model 131, 3M also created a wide variety of retrofit applications for existing conventional incandescent traffic signal heads. Each product was slightly based on the M-131's design by utilizing a combination of light-diffusing optics and a colored fresnel lens.
Model SA130 8" lens adapters
The SA130 lens adapters utilized a miniature version of the 3M Model 131 optics package. The SA130 consisted of a housing designed to be installed in place of an eight-inch conventional traffic signal lens, and light was provided by the existing signal lamp and reflector, and passed through a frosted glass diffuser. Unlike the M-131, however, these didn't include a clear optical limiter; masking was done directly on the diffuser lens. At the front of each housing was a miniature version of a M-131 acrylic lens/visor assembly.
Model 150 High Visibility Lens System
The Model 150 consisted of a 12" fresnel lens and reflector bowl assembly that was designed to be installed in place of a conventional 12-inch traffic signal lens/lamp and reflector assembly. These were rarely used and were produced for a limited period of time, and were later pulled from the market due to a condition known as "sun phantom."
Model 812 Signal Enlarger
The Model 812 Signal Enlarger was invented by Roger Appledorn (inventor of the 3M Model 123 and 3M Model 131), and Gunnar Ljunkull. The patent, filed July 24, 1972, and awarded on December 18, 1973, initially was designed to be a substitute for replacing then-conventional eight-inch signal heads. Each kit, essentially a retrofit application, consisted of a frosted diffuser lens that was installed in place of the existing eight-inch signal lens, and a bracket that consisted of a 12" fresnel lens that mounted to the existing signal via its visor fastening screws. The fresnel lens was typically clear while the frosted diffuser lens was tinted to meet ITE chromaticity and color output standards for traffic signals. Not very many of these Model 812 Signal Enlargers were ordered, largely because they could only be used on one indication in a typical traffic signal head. Some of them reside in traffic signal collections, and a variant of the Model 812 was built for pedestrian signal indications.
Read more about this topic: 3M High Visibility Signals
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