A Tunable white light is a luminaire which can provide different shades of white lightcolour temperatures, from cool white light to warm white light. This can be used together with a Scene Controller for aesthetic effect, or it can be used with a time-based controller to gradually change the colour temperature throughout the day for physiological benefits i.e. Circadian Rhythms.
Hardware in Luminaires
Wireless Radio Controllers switch lights on and off and set their output level using a DALI interface between the Wireless Radio Controller and the luminaire’s driver. The same DALI interface can also set the colour temperature of the light, provided that the driver can accept colour commands and the luminaire has a set of Warm and a set of Cool LEDs. A DALI driver that accepts Colour these special colour commands is known as a DALI Device Type 8 (DT8) driver. The driver will have two outputs for Warm and Cool LEDs:
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The usual way of changing LED boards to have both warm and cool colours, it to replace each White LED with two adjacent LEDs, one being Warm white (2,700 Kelvin) and one being Cool white (6,500 Kelvin). Doubling the number of LEDs on the board is unlikely to cause a thermal problem as the same total maximum power will be split between the Warm and Cool LEDs, thus creating the same amount of heat, but if anything dissipated more widely.
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Firmware
Most Wireless Radio Devices can send DT8 Messages. Some need special firmware:
230v G2 Node (with Special Software – v3.177 at time of writing)All Low Voltage Nodes (standard software)
All D4i Nodes (standard software)
All Batten Mounts (standard software)
E3M (Emergency Monitor) does not have a DALI output and some cannot control DT8.
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Additional profiles with different colour values and timings can be created by Glamox Staff. Please contact LMS Support your local Glamox salesperson and provide a written schedule of times of day and required colour-temperatures.
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