Energy savings using LEP luminaires comes from a combination of source and application efficiencies
- LEP’s source efficacy, lumens created per watt consumed, is 15-20% higher than an HID source, because no power is wasted in heating electrodes. Plasma light source efficacy ranges from 115 to 150 LPW at operating temperatures.
- LEP sources can be utilized to achieve application efficiency more effectively than HID, induction lighting or LED because of its directionality and size. The directional source prevents light from being trapped inside a luminaire. Point source optics effectively maps the source to the illuminated area, preventing unwanted light spill (a source for glare and light-pollution).
LEP is the only high-intensity light source that can be dimmed almost instantly to 20% of light output by dimmers or daylight sensors.
Dimming (based on occupancy or demand response) further reduces energy costs, and actually lengthens the life of the plasma lamp beyond the rated lifetime.
Application Efficiency Comparison: HPS vs. LEP
|460W HPS||280W LEP||Benefit|
|Fixture Efficiency||65%||85%||Directional source|
|Light Loss Factor||75%||85%||Low lumen degradation|
|Mean Fixture Lumens||24,375||15,572|
|Application Efficiency||48%||82%||Optical control|
Increase light output without compromise
One of the key benefits of LEP over LED and HID is the ability to scale in lumen output without losing efficiency and increasing system overhead like size and cost.
For example, in order to double the light output of an LED fixture, you need twice as many LEDs, optics, and driver. This proves to be problematic:
thermal cross-talk lowers efficiency of the individual LEDs, adding components drive up cost and compromises system reliability, and luminaire size increases proportionally.
LEP sources, on the other hand, can double in light output by simply scaling the size of the bulb and using a higher power amplifier which only marginally impacts system performance. In addition, the source size remains small compared to the illumination optics and the emitter becomes more efficacious, giving you higher optical efficiency at high outputs.
LEP’s maximum benefits are realized at high lumen output
When plasma light production is scaled to higher lumen packages, its efficiency and cost of ownership benefits increase compared to other lighting technologies.
|20,000 Lumens||40,000 Lumens|
|# of LEDs||150||300|
|1 LEP = 150 LEDs||1 LEP = 300 LEDs|
|# of LEPs||1||1|