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Differences between spectrally selective and conventional films in:
…blocking UV. Blocking UV is a function of both the film’s components and of the physical properties of the film itself. Both films block a significant amount of UV.
…blocking heat. The lower the shading coefficient, the lower the solar heat gain. Conventional, tinted films transmit more than 65 percent of solar energy and have a shading coefficient of 0.70. Some reflective films with a shading coefficient as low as 0.28 transmit as little as 15 percent of visible light. When considering heat rejection and light transmission, spectrally selective films outperform conventional.
…clarity. The best spectrally selective film transmits up to 70 percent of visible light, and in doing so possesses a clear appearance.
…cost. Tinted and reflective window film costs range from $4 to $6 per installed square foot. Spectrally selective window film ranges in price from approximately $9 to $12 per square foot installed.
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