Daylighting Always A Compromise

Daylighting is always a compromise. How much light do you need vs. how much solar heat gain can you accept.

When considering a daylighting system there are three main performance measures.

  1. Light Transmission
  2. U Factor
  3. SHGC

The more light transmission you require will result in more solar heat gain. Reducing light transmission to reduce solar heat gain is not always the best trade off. A daylighting model may be necessary to determine the appropriate light level.

CPI LogoIn our research and experience, the best product for currently on the market is UniQuad by CPI Daylighting. UniQuad has the best light transmission percentage to solar heat gain in the industry. Coupled with Skylight Specialists Inc, they can also provide assistance with daylight modeling and studies.

UniQuad vs. Non-Removable Skin Systems

Not all daylighting is created equal! Glass, fiberglass and other non-removable building envelopes can’t compete with the UniQuad system.

Daylighting Technology Visible Light Transmission NFRC-100 Center of Glass U-Value
Glass (Clear/Dbl Glazed, 90% Argon Filled) 79% 0.48
FRP (Crystal/Crystal w/batt insulation) 30% 0.29
UniQuad (Clear Matte/Clear Matte, Air Filled) 50% 0.23

The UniQuad system is the best of both worlds – it will give you up to 50% LT with a U-Value of 0.2

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