Facts About Energy Saving

How to Save Energy by using Led Lighting

LED ADVANTAGES

LEDs have several advantages over other lighting devices. The LED is a solid state device having no filament to heat or gas to ionize; therefore; no glass envelope, no gas or high voltage electrodes, and no mercury. LEDs are virtually immune to shock and vibration. They are very well suited for high vibration environments and extremely low temperatures where other light sources are short-lived and costly to replace. LEDs are truly a “green” product.

In theory, in a perfect LED with its junction temperature maintained well below 25°C, one might suggest the LED is a never ending light source. However, in the real world, the materials and doping cannot be perfect, and LEDs are almost always operated with junction temperatures well above 25°C. Naturally, heat will eventually alter most materials (even perfect materials). The LED luminous efficacy is inversely proportional to heat, and unlike any other light source, the LED produces more light at colder temperature, about 25% more at -40°C than at 25°C. They thrive and last much longer in extremely cold environments. The cooler they operate the happier and more efficient they are.

LEDs don’t “burn out”, they last the longest of nearly any other light source. Their output merely deteriorates to some unacceptable level; it is said, they fail gracefully. The typical monochromatic LED junction in a proper design, operating cooler than 75°C can provide 100,000 hours of operation to approximately 70% of its initial luminance. White or PC (Phosphor Converted) LEDs in a proper design, typically operating lower than 85°C will provide in excess of 50,000 hours of operation to approximately 70% of their initial luminance.

Since an LED primarily produces light, it is the most efficient full-spectrum light source we have (in 2009), with 110 lumens per watt efficacy when its junction temperature is maintained close to 25°C. Thus, the overall system design controls efficacy and lifespan, and can provide the longest lasting and most efficient light source.

 

COMPARISON OF LEDs TO OTHER LIGHTING SYSTEMS (each lighting system at a rated 100 watts)

TYPE

LUMENS

LUM/WATT
EFFICACY

MIN. SWITCH ON
TEMP.

25°C  SWITCH ON
TIME (1)

AVG. LIFE (2)

CCT

CFL

6200

75

-20°C

0.5 – 5 sec.

10000 hrs.

4200°K

HPS

9500

95

-40°C

3 – 4 min.

24000 hrs.

2200°K

INCAN

1700

17

-40°C

0.1 secs.

750 hrs.

2700°K

INDUCT

7000

70

-40°C

0.5 – 5 sec.

50000 hrs.

3000°K

LPS

14200

142

-20°C

7 – 10 min.

16000 hrs.

1700°K

MET HALIDE

8500

85

-20°C

2 – 5 min.

15000 hrs.

4000°K

MERC. VAP.

4100

41

-30°C

5 – 7 min.

24000 hrs.

3700°K

LED

11000

110

-40°C

Instant

50000 hrs.

2700°K – 6000°K

 

Notes:

(1)   Switch on time is time from initial power-on to full output with 25°C ambient temperature

(2)   Average Life for the LED and Induction Lamp is for lumen depreciation of 30%. Average Life for conventional lighting is when 50% of a sample population has burned out; and as a side note, remaining units still emitting light will have lumen depreciation beyond 50%.

DID YOU KNOW

Advantages of LED Lighting Basics & Facts Energy Saving Effects

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