
Below is a document which describes the energy savings you can expect to see by using Source Four fixtures.

Note that this document does not cover the 750W HPL lamp.

Energy savings with the Source Four

The 575 watt Source Four provides up to 40 percent more light than conventional 1,000 watt ellipsoidals while using 45 percent less energy, and 70 percent less energy than 2,000 watt units. The increase in both output and efficiency is due to a finely tuned optical system based on the revolutionary HPL filament design, a faceted, molded dichroic coated reflector and superior lensing. The Source Four operates with a very efficient lumens per watt ratio, ranging from 19.7 lumens per watt to 11.6 depending on the degree fixture used. Conventional ellipsoidals operate in the 9 to 7 lumens per watt range. This means that for every watt of power used, you get
more light on the stage with the Source Four.
Calculation models for demonstrating energy savings

All of these words will be useful in presenting your case, but how do you arrive at hard facts to prove the power savings that will let you justify replacing existing equipment with energy efficient, high performance Source Four ellipsoidals? The two calculation models below illustrate the energy savings gained when you use Source Fours. Simply substitute the appropriate numbers as required by your facility.
Model 1 for calculating energy savings with Source Four

Assume an average venue with:
 250 ellipsoidal fixtures,
 Few or no dark days (setup, performances, rehearsals, etc.)
 Fixtures on for three hours, 365 days a year
 Fixture intensity rated at 80 percent as not generally run at full for all hours of use.

 Conventional rig with FEL, 1000 watt lamps in standard ellipsoidals:
 250 x 1,000 watt = 250,000 watt
 250,000 watt x 3 hours = 750,000 watt
 750,000 watt x 365 days = 273,750,000 watt
 273,750,000 watt x 80% = 219,000,000 watt yearly
Model 2 for calculating energy savings with Source Four
Comparison of customer’s existing inventory to the wattage and energy savings gained by replacing inventory with Source Fours.
Conventional Rig:

Type 
Unit 
Quantity 
Watts 
Yearly kW Hrs* 
Dollar Cost** 
Altman 
4.5 
10 
750 
9,360 
$5,616.00 
Altman 
6x9 
60 
750 
56,160 
$33,696.00 
Altman 
6x9 
20 
1000 
24,960 
$14,976.00 
Altman 
6x12 
20 
750 
18,720 
$11,232.00 
Altman 
6x12 
30 
1000 
37,440 
$22,464.00 
Altman 
6x16 
20 
1000 
24,960 
$14,976.00 
Total 

160 

171,600 kW/hr 
$17,160.00 
 *=Based on three hours per show, eight performances per week, 52 weeks a year.
 **=Based on $.10 per kilowatt hour. Use the appropriate local rate for your calculations.
HVAC energy savings
Source Four uses less watts than conventional ellipsoidals. Watts equal BTU’s (thermal energy). So if you can reduce the watts at an installation, you will reduce the amount of load that the facility air conditioning plant must carry. HVAC energy savings of up to one third can be realized with Source Fours during months in which a facility is air conditioned.
5 and 10 degree Source Fours
The energy savings figures become even more impressive when you calculate comparing standard 2,000 spotlights with the ultra efficient Source Four 575 watt 5 and 10 degree ellipsoidals. The 5 and 10 degree Source Four use 70 percent less electricity and operate at 13.9 to 19.7 lumens per watt efficiency.