This example shows a sports hall with daylight ingress through a number of windows. The hall has an entrance and has no folding partition for subdivision. It is used for various types of activity ranging from exercise gymnastics to for indoor bandy and handball league matches. The various activities do not require equally strong lighting, so an installation with three lighting levels has been fitted:

approx. 30 per cent – basic lighting/exercise lighting (automatic activation)
approx. 50 per cent – game lighting
80 per cent – match lighting
The required lighting levels are set in the NV-4T.

Light sources

The fittings in the hall have dimmable HF operating devices. We recommend that the number of fittings be overdimensioned so that match lighting can be adjusted to 80 per cent. There are several advantages to this solution:

• The operating devices undergo a lower working temperature, thus considerably prolonging their life span.
• Increased life span for the fluorescent tubes.
• Reduced maintenance costs as a result of longer life span.

The control system is based on the NV-4T level selector with a 4.7 kO resistance between contact units 7 and 8. (The resistance connects up the ‘sports hall function’ in the NV-4T.) Presence in the hall is detected by a PD-2200 IR detector with Lens No. 15 (41*41 m). Upon entry into the hall the basic lighting is switched on by the IR detector if the natural light from the windows is insufficient. This is controlled by a light sensor that measures the light in the hall and blocks activation if the light is sufficient. If the activity in the hall requires more light the lighting can be switched on in two further stages. Game lighting is switched on using a pulse-generating push-button. Renewed pressure on the button switches the lighting off. It should not be possible for just anyone to activate match lighting, thus a code lock or key switch is used.

When the presence ceases the lighting is completely switched off after the delay (5 – 7 minutes) set in the IR detector. The game lighting and match lighting can be switched off manually using the push-button or code lock. With all deactivation the fluorescent tubes remain switched on at a level of about 2 per cent for about 15 minutes (adjustable) before they are completely switched off.

Positioning of detector

Positioning of the detector is crucial to the function! The example below shows how the detector should be positioned. With this positioning optimum detection is achieved upon entry, and the detector does not look out through the entrance, which means the lighting does not remain switched on when someone passes by outside. The detector is positioned in the corner furthest away from the entrance at a height of 2 – 2.5 m. The mounting height is very important to reliable detection. Mounting too high up can result in relatively large areas with poor detection.

A protective grating is used for corner mounting to protect the detector against balls etc.

Information for current budget

• Base lighting 30 per cent, switched on automatically
• Game lighting 50 per cent, switched on using pushbutton
• Match lighting 80 per cent, switched on using code lock or key switch

1. The teacher prepares the hall for the first class. The natural light is inadequate and the lighting is switched on automatically at the 30-per-cent level.
2. The first class starts at 8.10, an exercise class, for which 30-per-cent lighting is sufficient.
3. Break: lighting is reduced around 5–7 minutes after the last person leaves the hall.
4. The second class starts with a warm-up period at 30-per-cent base lighting (switched on automatically), after which a game of indoor bandy is played with the lighting increased to the 80-per-cent level using the code lock.
5. Break: lighting is reduced around 5–7 minutes after the last person leaves the hall.
6. Lighting is switched manually to the 50-per-cent level using the pushbutton when the third class starts (basketball).
7. Lunch break: lighting is reduced around 5–7 minutes after the last person leaves the hall.

8. An aerobics class starts at 13.00. There is sufficient natural light so that the light sensor prevents the lighting from being switched on automatically.
9. Indoor bandy class: the lighting is switched to the 50-per-cent level using the pushbutton.
10. Teaching is finished for the day: lighting is switched off around 5–7 minutes after the last person leaves the hall.
11. The indoor bandy team has a training session: the lighting is switched to the 50-per-cent level using the pushbutton.
12. Aerobics class: the lighting is automatically switched to the 30-per-cent level.
13. Basketball league match. During warm-up, lighting is set to 50 per cent (using pushbutton), and then increased to 80 per cent at start of match (using code lock).
14. Everyone leaves and the lighting is switched off around 5–7 minutes after the last person leaves the hall.
15. Someone comes back to pick up a forgotten bag, and the lighting is switched on automatically to the 10-per-cent level, then switched off after 5–7 minutes.