warehouse light level control

Hi Guys,

Just wanted some input on the best way to program my latest mission.
It is a large warehouse situation with led lights on multiple group addresses, that will be controlled by a single PE cell.
They have asked for the following:
1) When the PE cell reads 'x' lux, all lights will be on.
2) When the PE cell reads 'y' lux, it will shed half of the lights.
3) When the PE cell reads 'Z' lux, all lights will turn off.

I have a logic enabled spectrum touch screen in the installation that will be used to turn lights on in the morning and turn off at close.

Thanks.

 

One PE Cell?

Hi Mark

I don't think you can't do it with one PE sensor without Logic, but you could do it with 2 PE sensors.
Trying to assist here but what you are doing in terms of lighting design is a complex field.

Why have a "Large" warehouse controlled by one PE cell? If you do this the positioning of it will be ultra critical as what that PE cell see's it will dictate for the whole warehouse.
Assuming there must be transparent panels in the roof to allow natural light hence you want to reduce the artificial light contribution from the Luminaires. In general if natural light is only coming in the horizontal apertures (roof) you will have less variation as the sun transverses across the sky, unless something casts shadows across your building. If there are no vertical apertures for natural light to enter (windows / roller doors) this might work OK but the position of the PE is critical, you will have to put it in the most central / common space/area. If you have the PE over an area lit by a vertical aperture it will not work.
By turning every second luminaire off this will stuff the uniformity of the resultant lighting across the space. If it is an open area you might get away with it, if there are high storage racks it will be horrendous.
Have you ever seen this done before? probably not because it is fraught with issues. That's why dimming is used, and in the case of high bays step dimming is a good solution.
I'm not going to comment on the LED lights, if they are "high bay equivalents" I hope you know what you are doing.
In terms of energy efficiency, don't have your touch screen schedule the lights on, make the first user in turn them on (then you never have to program for variable public holidays) and if need have an auto off.

Sorry to be a wet blanket! Hope that give you some things to consider and saves you any expensive reworking.

Regards
Matthew
PS if you need further assistance you can PM me.