Design best practice
One of the most important considerations is specifying products that produce light with a warmer colour temperature to minimise the amount of blue light while ensuring a high CRI for clarity and visibility.
Advances in LED efficiency mean that warmer colour temperatures can now deliver equivalent light output levels of cooler light sources from just a few years ago. In addition, warmer LEDs now offer improved CRI performance compared with sodium products of the same colour temperature.
For example, comparing a 1950K high-pressure sodium product to an equivalent 1800K LED, the CRI is almost three times higher – Ra25 compared with Ra70.
In addition, the development of tuneable white LED technology now provides designers with another tool to help solve the issues of urban lighting. Tuneable white systems (such as the one found in our Daytona luminaire) typically utilise two separate colour temperatures (for example 3000K and 2200K) that, when mixed at different intensities, can produce a range of colour temperatures.
The technology allows the light to be varied from cooler colour temperatures, which can improve visual comfort and offer a sense of security, to warmer, ‘softer’ light that helps minimise the negative effects on wildlife and people.
Varying the colour temperature of the light can significantly impact blue light content. For example, the blue light peak of a 2200K source is as much as 66% lower when compared with 3000K.