[SML] LED conversion

[Ben Thoron SML]

All true.
However...
Imagine a backlight system of PAR 64 fixtures (1kw to keep the math
easy)  The replacement is is an ETC colorsource PAR, rated at .09kw.

On the face of it- that's a 90% reduction in power consumption potential.
Except that it's hard to turn into KWH for calculating cost savings.
How long is the backlight system on?  at what intensity?  Is it the
same for all shows in a season? And all the other permutations and
variations that can happen day to day.

Further, the LED power consumption is actually color-dependent, for
instance using the charts on the etc website matching a deep blue gel
uses less than 45watts.

At what point do you just start using a random number generator to
estimate the savings?

I should go home and see what's in the fridge to may me feel less anxious.

Ben Thoron
Production Manager
The Old Globe




On Wed, Oct 23, 2019 at 5:28 PM Jerry Durand via Stagecraft
<stagecraft at theatrical.net> wrote:
>
> If you already have the fixtures picked out, then you can get in the
> general range this way...
>
> Before:
> Watts for lamps + dimmers in normal use PLUS that number of Watts heat
> load on the air conditioner for summer OR MINUS Watts on heating system
> for winter.
>
> AFTER:
> Wattage used by LEDs (use same percentage of power/time as for
> incandescent) of heat load on the A/C for summer or minus for winter.
>
> Short form:  In hot weather you save more than you think due to reduced
> A/C loads and the potential to use smaller cooling systems.
>
> In winter you pay more for heating while still saving on electricity.
>
>
> On 10/23/19 5:19 PM, Ben Thoron SML via Stagecraft wrote:
> > We're planning to convert 50% of our incandescent fixtures to LEDs in
> > the next several years.
> > It would be useful to be able to justify the expense by calculating
> > the energy savings.
> >
> > All the variables of usage, intensity, color, and differences between
> > light plots are making my head hurt.
> >
> > - Has anybody had success in either calculating the energy savings or
> > measuring them?
> >
> > Thanks ever so much,
> >
> > Ben Thoron
> > Production Manager
> > The Old Globe
> >
> > ____________________________________________________________
> > For list information see <http://stagecraft.theprices.net/>
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>
> --
> Jerry Durand, Durand Interstellar, Inc.
> www.DurandInterstellar.com
> tel: +1 408 356-3886
> @DurandInterstel
>
>
> ____________________________________________________________
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> Stagecraft mailing list
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