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There are several ways to light up glass blocks. The least expensive is putting florescent tubes behind the blocks. This one has the shortest life and you must have access to the back. Needless to say, you can’t use this method if you want two sided viewing.
A second method is putting fiber optic cable behind the glass blocks. This is a permanent installation and it can change color, but it isn’t as bright as the florescent tubes. Again, only one sided viewing.
The most pleasing method is placing fiber optic cable between the blocks. This is a permanent installation, can change color and it offers double sided viewing. The minimum fiber optic illuminator is a 150w metal halide such as the S150-8. If the ambient lighting is medium to high then you will need the 250W illuminator, the DEL250-8. Both use the S-SO75 fiber optic cable.
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