Sign & Digital Graphics

September '18

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Page 33 of 104

S I G N & D I G I T A L G R A P H I C S • September 2018 • 29 count is the same, the apparent or "sco- topic" lumens that the eye sees is about 25 percent to 30 percent higher at 7000K versus 4000K. So, this factor should be considered when brightness is key. The higher the C C T , the higher the scotopic brightness. Like anything, however, this can be taken too far. Some "bright" imported LEDs are often in the 9000-12000K range. This very strong bluish-purple hue can create a very harsh lighting effect. While this may seem like the best choice in the shop, when it goes into the field, it can look very purple, especially if other lower CCT signs are in the area or nearby. The human eye is very sensitive to shade variation (we can actually see about 300 shades of white). Therefore, I recom- mend the use of LED modules for generic channel letters in the 6000-75000K range to give an attractive eye-popping effect. Warmer colors (3000-4000K) should be used when the client is trying to achieve a less intrusive, softer and more inviting effect. A neutral effect can be achieved in the 4500-5500K range. Many tier-1 LED manufacturers offer their LED modules in a range of color temperatures. Having a variety of options of white can help you in the prototyping process and eventually secure business by being able to meet the color effect the customer wants to achieve. Principal LED's Street Fighter Family addresses the need for a variety of CCTs. The module comes in four of the most commonly needed color temps: • 3500K (Warm White) • 5000K (Natural White) • 7000K (True White) • 9000K (Cool White) Figure 3 shows the difference between the various color temperatures of Street Fighter on a white acrylic face. Figure 4 features a sign that was retro- fitted using Street Fighter Heavyweight in 7000K. Importance of CCT and CRI Understanding both color tempera- ture and color rendering are important when helping your customer achieve the look they desire. In the case of graph- ics, color rendering and overall fidelity (driven by CRI) is key; however, color tint or hue (driven by CCT) is really a matter of customer preference when it comes to channel letters. Knowing the difference will help you make an informed decision when you build your next LED backlit sign. SDG Color temperature and color rendering are important when helping your customer achieve the look they desire. American RENOLIT Corporation manufactures premium calendered lms for self-adhesive applications and serves customers in the sign, graphics and labeling industry. We strive to oer our customers the very highest quality using only the best raw materials and state-of-the-art calendering technology. High quality: our philosophy – your added value. Rely on it. Visit us at: Premium Calendered Films Quality that sets your products apart

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