Question 1. What's the CCT of the Lighting maintained?
Answer: For Stadium lighting the target is between 5000K and 6000K. This is so the broadcasters don’t see a big difference in the transition between daylight and artificial lighting.
Question 2. What is the most attractive market looking up for the upcoming 3 years: US, Europe, Middle East or China?
Answer. The market follows the competitions so there is currently a lot of activity in the Middle East. In Europe its more upgrading existing stadia with a growing interest in fan experience.
Question 3. What is a typical design cycle life using LEDs compared with 'old days' with HMI etc?
Answer. A typical lifetime of an HMI installation would be 6000k to 50% failures. With LED’s life is defined by loss of light which can be 10% loss at 100,000h. With LED’s you also have to take into account ambient temperature as this affects light output. Over the last 10 years efficiency of LED’s has increased significantly so replacing an early LED installation could be viable on grounds of energy saving.
Question 4. I am often faced against ecology, where ILP BCT (Bat Conservation Trust) guidance 08/23 stipulates 2700K, there are very few 2700k sports floodlight and are not commercially available, i know sports guidance says 4000k plus (why?), the argument is colour appearance, but if CRI is is 80+, i struggle with this argument.
Answer. This is quite a big topic at the moment, but for Stadia the range is 5000K – 6000K for broadcast. The discussion is around Club/Recreational. The argument is that the lighting is there for Atheletes who prefer the cooler (4000K) for performance and if it wasn’t for the Athelete there wouldn’t be any lighting. The following is part of the proposed text for EN12193:
To minimise the ecological effect of outdoor sports lighting the following should be considered:
1. Select the most suitable lighting class for the level of play.
2. Ensure light is controlled so it only illuminates the area of play
3. Use lighting controls to dim lighting in between playing sessions
4. Choose the right spectral output to minimise the effect on animals and plants
Light Source Spectrum
It is known that the spectral composition of the light source can impact animals and plants, although the effect is not known for all species. It is therefore difficult to have one solution that covers all possibilities. For species affected by the blue end of the spectrum, just selecting the colour temperature may not give the level of control required. LED sources have a strong blue peak independent of Colour Temperature.
For general areas the percentage output in the region of 380nm-480nm should be equal of less than 19% of the total light output. This generally will be found with light sources where the Colour Temperature is =< 4000K
For protected areas the percentage of light in the region of 380nm-480nm should be equal or less than 9% of the total light output. This generally will be found with light sources where the Colour Temperature is =< 3000K
We try to take the focus off colour temperature and use actual spectral output as its possible to “play” with the spectrum to have a cooler appearance without a high blue content.
The Signify Clearflood is available from 2700K – 5700K
