SDR Facility Solutions Coop Catalog - Page 737



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Landscape Lighting
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bill. A lamp’s true power (wattage) is listed on the lamp’s packaging. When an LED is powered,
the lamp’s driver converts alternating current (AC) to direct current (DC), which consumes reactive
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generate additional energy above and beyond the lamp’s true power in order to operate the lamp.
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and is referred to as apparent power. Power factor - the ratio of true power to apparent power PZ[OLTLHZYLVMOV^LMÄJPLU[S`LSLJ[YPJHSWV^LYPZJVUZTLK+P]PKPUNHSHTW»Z^H[[HNLI`[OL
lamp’s power factor results in the VA drawn on the line - Wattage/Power Factor = Volt-Amperes.
Halogen and Incandescent lamps have a power factor of one, which means that the lamp uses
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transformer’s rating.
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and annual energy cost calculations.
1. Calculate Load of LED System
Lamp VA
Well Light with 6.5W ProLED PAR36
Modern Bullet with 4.5W ProLED MR16
_ # Lamps $;V[HS3TPUHPYL3VHK
10.9
8
= 87
5
4
= 20
Total System Load
107
2. Select Transformer for the LED System Load
3. Calculate LED Energy Consumption
Lamp Wattage _ # Lamps = Power Consumption
Well Light with 6.5W ProLED PAR36
6.5
8
= 52
Modern Bullet with 4.5W ProLED MR16
4.5
4
= 18
Total System Power Consumption
70
4. Calculate the LED System’s Annual Energy Cost
*VUZTW[PVU_





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