Internal Gains - Lighting

[charalad]

Hello,

I am trying to simulate a lighting dimming strategy. I used Radiance to place sensors and create the dimming profile using the RAMP function. My question is, when assigning the profiles in the Room Data window, which profile is assigned to the Variation Profile and which to the Dimming Profile? So basically, what is the difference between the two?

Thanks.
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[Marc Jensen]

Hi Charalad,

The variation profile is when the lights are either on or off.

The dimming profile is the light intensity when the lights are on only, driven by the variation profile.


Ie the 8-6 lighting will be at 100% brightness but your dimming will control the % brightness.


Something like:

RAMP(e1,0,1,500,0.3)

This will say that the sensor will throttle the light brightness down to a minimum of 30% light brightness when the sensor reads 500lux.



You need to be careful when placing sensors. They must not be more than 6m away from a window.

Your best solution is to partition rooms (without partitions) and have the sensor placed in the centre of a 6m zone.

This is because direct sunlight with the number of rendered bounces in IES / in practise diminishes after 6m away from a window.

Hope this helps.

[charalad]

Hi Marc,

Thanks for your help. Just to make sure, if I want no dimming profile to be applied in a room, I would set the dimming profile to off continuously, right?

[JohnLloyd]

No, if you want no dimming then the dimming profile should be 'On Continiously'. i.e. 100%

Run a few tests with different settings and look at your lighting gain result in Vista. You can soon work out what it is doing.