Re: [EnergyPlus_Support] Re: lux and watts

["vincent lacour vlacour@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Thanks Rahul, but this does not address the issue.  Everything in Daylighting:controls is inLUX whereas everything in Lights is in Watts.  What is missing is the efficiency of the lights, i.e. how much LUMEN you can get with 1W.  With a led you get 50 lumen; with an incandescent light bulb you get only 10 lumen.  There must be a lumen/watt ratio under the energyplus hood, but where????

On Thu, Jun 19, 2014 at 6:09 PM, rahula7@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

If you look at the Daylighting:Controls object, there are a number of fields:

- Lighting control type

- Minimum input power fraction for continuous dimming control

- Minimum input power fraction for continuous dimming control

- Number of control steps

These fields combine to determine how much lighting power will be supplied after subtracting the daylight contribution. It's all there in the I/O Reference.

Rahul

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Posted by: vincent lacour <vlacour@xxxxxxxxx>

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