Specifying Lighting Connection and Control

Ben Byram, Hager's Klik Key Account Manager goes into detail and provides valuable insight and tips on how to prepare a specification from the point of view of a lighting connection and control supplier. 

Klik lighting connection

In­sights and Tips on Spe­cify­ing Light­ing Con­nec­tion and Con­trol

Over the years, most of the pro­ject spe­cific­a­tions we en­counter are clear and con­cise,  however, in some cases, the types of lan­guage used can cause some con­fu­sion. This art­icle will look into ex­amples of those types of is­sues as well as provide some in­sight and tips on how to pre­pare a spe­cific­a­tion from the point of view of a light­ing con­nec­tion and con­trol sup­plier.


1. Daylight linking

This has proven to be the num­ber one source of con­fu­sion within spe­cific­a­tions. While it is an im­port­ant en­ergy-sav­ing fea­ture within a pro­ject it’s the use of the word­ing that has caused is­sues in the past. It is im­port­ant to ap­pre­ci­ate is that there are in fact two dif­fer­ent meth­ods for day­light link­ing.


a) Daylight switching –
This method is typ­ic­ally util­ised when stand­ard HF light­ing is used. This means that the light­ing will switch On and Off in con­junc­tion with the pho­to­cell con­trolling the light­ing if the LUX level is read­ing a pre-set level. We would ad­vise that when us­ing this method you also use a method of delay­ing the day­light switch­ing for 2 minutes as an ex­ample. By do­ing this, the pho­to­cell will only switch On or Off after the LUX read­ing is con­sist­ent for a set amount of time. This will pre­vent the light­ing from switch­ing on or off con­stantly, catch­ing people’s at­ten­tion. 

b) Daylight dimming –
Used where dim­mable light­ing is needed this acts sim­ilar to the day­light switch­ing with the pho­to­cell however,  the light­ing dims up and down ac­cord­ingly. Un­like the day­light switch­ing method, there would be no need to delay the dim­ming of the light­ing as the light­ing would dim gradu­ally without the oc­cu­pants really no­ti­cing, res­ult­ing in the main­ten­ance of con­cen­tra­tion levels. 

2. Scene setting
A topic that you will of­ten see men­tioned within a spe­cific­a­tion is scene-set­ting in­side cer­tain areas of a build­ing. Within some areas, there’s a genu­ine need to con­trol the light­ing with scenes, for ex­ample in a meet­ing room in­side an of­fice build­ing. In some cases, there will be a mis­judge­ment in the spe­cific­a­tion, where there will be a call for scene-set­ting in a small meet­ing room that has just 2 lu­min­aires. This is an ex­ample of where the light­ing could be con­trolled dif­fer­ently with the op­tion to manu­ally dim the light­ing up and down, al­low­ing for a more suf­fi­cient solu­tion given the area.

An­other area where scene-set­ting is used is within classrooms. There is a com­mon mis­con­cep­tion in re­la­tion to scene-set­ting, where for ex­ample, many people as­sume this is ap­plied within a typ­ical classroom where the teach­er's wall is switched in­de­pend­ently along with the whole room at the en­trance of the classroom. When in fact to achieve this light­ing ar­range­ment, mul­tiple chan­nel light­ing con­trol mod­ule (LCM) is used and the light­ing is man­aged with chan­nel con­trol.

3. Lighting connection system
Do you ever think about the im­pact that the light­ing con­nec­tion sys­tem can really have on your build­ing? Hav­ing a safe and ro­bust con­nec­tion sys­tem along with flex­ib­il­ity is im­per­at­ive to the over­all con­trol of your light­ing.

Tak­ing into ac­count the main­ten­ance of the light­ing we re­com­mend us­ing a sys­tem that is fully com­pli­ant to On­load con­nec­tion and dis­con­nec­tion as well as hav­ing an elec­tromech­an­ical con­nec­tion, which im­proves the safety of the sys­tem be­ing used. Not only does it re­duce the dis­rup­tion be­ing caused by hav­ing to isol­ate cir­cuitry but it also saves time for the main­ten­ance of the lu­min­aires as and when re­quired.


4. Timed profile switching

A key part of a pro­ject is to try to re­duce the en­ergy con­sump­tion where pos­sible, and the dif­fer­ent ele­ments of con­trol such as day­light dim­ming and con­trolling light­ing through oc­cu­pancy sensors goes a long way to help­ing this. However, you can take this concept a step fur­ther and im­ple­ment ad­di­tional re­duc­tions by us­ing timed pro­file switch­ing. 

For ex­ample,  you can have the light­ing work­ing at the same out­put throughout the day no mat­ter what time of the day it is, but by im­ple­ment­ing timed pro­file switch­ing more op­tions are avail­able to you. Be­low area couple of scen­arios that can be used:

 

a) 08:00 – 18:00 – You may have all areas on a 20-minute pres­ence/ab­sence de­tec­tion along with the day­light dim­ming etc

b) 18:00 – 08:00 – This is where some en­ergy could be saved should the build­ing be oc­cu­pied dur­ing these hours, and you could per­haps re­duce the de­tec­tion time down to only 5 minutes dur­ing these hours of the day. Quite of­ten dur­ing these hours, you would only have clean­ers or se­cur­ity within the build­ing and there­fore there would­n’t be a call for the light­ing to stay on for so long without de­tec­tion.

 

18:00: 08:00 – As a second op­tion, you could set the sys­tem up so that only 50% of the light­ing is ac­tu­ally switched on dur­ing these hours of oc­cu­pancy, which of­fers a fur­ther re­duc­tion in the en­ergy con­sump­tion from the light­ing.

 

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