Energy, The amount of electricity your fixtures use.

[MircleWorker]

I have been working an a spread sheet on the amount of energy my Lighting fixtures use.

ETC Source Four 575W/120V
Lamp life 300hrs/2000hrs
Cost of electricity: $.11 KWhr
Cost of electricity over the life of Lamp: $189.75
Lamp cost:$18.00
Number of Lamps at 50,000 hrs: 166.667/25.00
Lamp cost at 50,000hrs: $3,000.00/$450.00
Energy Cost compared to 50,000 hrs: $31,625.00
Total cost:$34,625.00/$32,075.00

but to get to 50,000hrs running approx 2hrs a day it would take many years.

I know there are different variables to think of, power output and Labor cost. I was just looking at raw electicity cost and Lamp cost.

 

[JChenault]

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I have been working an a spread sheet on the amount of energy my Lighting fixtures use.

ETC Source Four 575W/120V
Lamp life 300hrs/2000hrs
Cost of electricity: $.11 KWhr
Cost of electricity over the life of Lamp: $189.75
Lamp cost:$18.00
Number of Lamps at 50,000 hrs: 166.667/25.00
Lamp cost at 50,000hrs: $3,000.00/$450.00
Energy Cost compared to 50,000 hrs: $31,625.00
Total cost:$34,625.00/$32,075.00

but to get to 50,000hrs running approx 2hrs a day it would take many years.

I know there are different variables to think of, power output and Labor cost. I was just looking at raw electicity cost and Lamp cost.

I think your math on energy costs is a bit off. 50000 of a 575 watt lamp looks to me to be 28,750 kwh
(50,000 * 575)/1000. Multiplying by .11 gives me an electricity cost
Of 3162.50

 

[MircleWorker]

That's why I posted on here, to get help.

Bush, got away with fuzzy Math!
Thanks, JChenault

 

[zackt]

Add the color scrollers, scrolls, cable, brain etc in there and then you'll get much closer to your "look boss, the cost over time is equal" place.

 

[Footer]

Don't forget about the amount of power it takes to cool the dimmers and the halls that the lights hang in. I have actually never heard of a single theater bring up energy costs of the lighting system. I actually doubt that the stage lighting system makes a significant dent in the power draw of most modern performing arts centers. Instead heating/cooling, hot water, and building lighting probably eat up the most power.

My math has a 575w S4 using 6.32 cents of power an hour. A 750 uses 8.25 cents an hour. A 1k uses 11 cents. All at 11 cents per KWhr. Finally, an LED S4 uses 0.99 cents an hour.

Because no one runs their lighting system 24 hours a day unlike heating/cooling and hot water, the effect is not as large as one would think. It takes a lot of power to heat and cool large buildings.

So, where is the break even point for an LED S4?

 

[JLNorthGA]

Using some of the figures "bandied" about.
Regular Source Four - 30,000 hours of service, $18/bulb, 30,000 hours of energy costs, $375 for the instrument, 100 bulb changes = $4071
LED Source Four - 30,000 hours of service, no new bulbs, 30,000 hours of energy costs, no bulb changes = $297 for energy costs.

The HVAC costs for cooling and heating the building would be less with LED Source Fours. So figure let's say the LED Source Four costs $1100. The "break even point" would be about at 6000 hours, figuring 20 bulb changes for a regular Source Four. It would possibly be less than 6000 hours. Might be okay for a big theatre. Heck, if I have 5 hours a week on my instruments, that's a lot.

 

[MircleWorker]

I even was looking into how long fixtures Last and Gel Cost.

All I want is more budget to start getting more effeciant LED Fixtures.