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Trough
Essentially, Troughs are the opposite of a flat-faced letters. The face of the letter has a sunken effect and is open with a solid back. It’s the letter of choice for those wishing to create a retro design with LED bulbs embedded into the face.
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Rim Faced
Rim-Faced, built-up letters are the standard manufacturing method for acrylic faced letters when illuminating with LED. This type of built-up letter has the most strength and endurance.
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Rim Less
Rimless letters allow for the full face of the letter to be illuminated, and are the perfect option for small to medium sized letters.
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Rim Grooved
Similar in appearance to the rimless letter but to add strength a groove is routed for the return to sit in the face; adding extra strength.