Question : What is an LED ?
Answer : Light-emitting diodes (LEDs) are solid-state lighting components. Each LED consists of a semiconductor diode that emits light when a voltage is applied to it. They have no moving, fragile parts & can last for decades. LEDs can be many times more energy-efficient than conventional light bulbs or CFL's, depending on the application. LED lighting can save up to 85 percent of the electricity used by incandescent bulbs and up to 50 percent of electricity used by fluorescents/CFL's. The electronics industry has used LED technology for several decades as indicator lights for various electronic devices. In more recent years, LED technology has progressed to the point where it is viable for general lighting applications. Most of the energy emitted from incandescent bulbs is converted to heat instead of light. That's why you'll burn yourself if you try to touch an incandescent bulb once it's turned on. Since LEDs consume significantly less energy, they don't emit as much heat. That's why you typically won't burn yourself if you try to touch an LED light once it's turned on. LED lights are also designed to last about 50 times longer, which means less ladder-climbing maintenance and less waste.

Question : Why are LEDs considered a GREEN technology ?
Answer : LEDs are environmentally friendly on many fronts. First, unlike HID (High Intensity Discharge) lamps LEDs contain NO mercury.
Assuming an HID fixture is re-lamped every two years, that’s five re-lamping cycles over a 10 year period.  Just imagine the benefits of choosing LED:
•    No concern over proper disposal (hopefully not simply thrown in a landfill) of old HID lamps  
containing harmful mercury.
•    No fuel used and the accompanying pollution to service those fixtures.
•    No natural resources lost to produce the replacement lamps that contain mercury.
•    No fuel used to move old-technology lamps from the factory, to the distributor, to the
contractor, to the job site.
It’s important to keep in mind all the positive and powerful ripple effects that using LED technology can have on the environment.

Question : Where have LEDs been used in the lighting industry ?
Answer : LEDs began to be used in the lighting industry in the late 1990's typically in aesthetic, effect, or specialty lighting applications, including architectural highlighting. The use of LED luminaires in applications such as residences, hospitality, retail, street lighting, area lighting, parking structures, security lighting, is viable today both economically and from an illumination performance standpoint.

Question : What are the advantages to using LED luminaires ?
Answer : LEDs bring several advantages to the lighting industry, including high efficacy and durability, and, with superior life over other lamp sources, their required maintenance is greatly reduced. This translates into energy savings, maintenance savings, and environmental sustainability. There is also the potential for greater optical control (more controllable source), dimming, instant on/off, and reduced rate of lumen depreciation (potential for long application life).

Question : Does turning LED lighting on and off reduce lifetime ?
Answer : No. Unlike incandescent and fluorescent lighting which will fail sooner when switched on and off more often, LED lighting is unaffected by how often it is switched on and off.

Question : Are your products compatible with emergency backup systems ?
Answer : Yes, with inverter style battery backup systems that produce true sinewave outputs. When sizing Emergency Backup Systems, multiply the nominal power load by 2.5x to determine the size of system needed.

Question : What do "cool white" and "warm white" mean ?
Answer : Correlated Color Temperature (CCT) is defined as the color of light given off by a particular light source that most closely represents the light emitted from a perfect blackbody radiator when heated to a certain temperature. Incandescent lamps have a typical CCT of 2700K (warm white light). 4000K is generally considered "neutral" white light or daylight. The color (CCT) of our lighting products ranges from a warm yellow white (2700K) to daylight (4000k) and to a cool daylight (5500-6500K). By comparison, a typical incandescent bulb has a CCT of 2800K. A typical halogen is a bit higher, maybe 3500K. Daylight white is 4000K and a cool white fluorescent is 6000K or nearabouts.

Question : What is CRI, and why is it important ?
Answer : Color Rendering Index (CRI) is defined as a light sources ability to render color. The higher the CRI, the better the light source renders every color in the visible spectrum. To have what is generally considered good color rendering, a source must be >90 CRI.

Question : Can LED lights make my life easier ?
Answer :Litecraft LED Lighting products are designed to last as long as 50,000 hours.  Incredible longevity means that you might never change another light again.
A Generation of Light
What is 50,000 hours? It is 50 times the life of a typical incandescent bulb and 5 times the lifetime of an average compact fluorescent lamp (CFL).  In fact, if you ran one Litecraft LED light for 6 hours per day every day, it would last for nearly 23 years. That is time for a home remodeling, and the expanse of an entire generation.
Reduce Maintenance and Labor 
We all have at least one light that is hard to reach and needs a ladder or a pole to replace it. For a home owner, fifty times longer life than incandescent bulbs means 50 fewer chances to fall off a ladder.   For a business owner, it means significantly lower maintenance and labor expenses.
Reduce Your Waste Stream The production and use of LEDs requires significantly less energy than incandescents or CFLs.  With Litecraft LED Lighting products, you'll throw away fewer lamps and stop worrying about their mercury content.  All Litecraft LED Lighting products are free of mercury and other toxic materials, a clear win for the environment.

Question : What's the difference between efficiency and efficacy ?
Answer : Lighting fixture efficiency is the ratio of the total lumens exiting the fixture to the total lumens initially produced by the light source. For example, if a bare 100W incandescent lamp (light bulb) produces 1,000 lumens, and it is put into a lamp fixture that delivers 700 lumens, this would be an example of a 70% efficient fixture. 
Efficacy is a term normally used in cases where the input and output units differ. In lighting, we are concerned with the amount of light (in lumens) produced by a certain amount of electricity (in watts). Efficacy = Lumens Per Watt

Question : What does "Lifetime 50,000 hours" mean ?
Answer : Useful life has been defined as the number of hours an LED device can operate until it emits only a certain percentage of its original lumen output. For general illumination applications, vision research suggests that 70 percent of original lumen output is the level where end users begin to notice a drop in light levels. This metric is indicated as L70. The Illuminating Engineering Society of North America (IESNA) published LM-80-08, IES Approved Method for Measuring Lumen Maintenance of LED Light Sources. We have tested our LED lamps for long-term lumen maintenance consistent with LM-80 methods to demonstrate L70 life after more than 6000 hours of testing and got the number 50,000 hours under normal operating conditions.

Question : Why is the life span of an LED measured as lumen depreciation ?
Answer : The life span of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources, generally lasting 50,000 hours or longer. Although the LED never really burns out, product life span is measured by lumen depreciation. The Illuminating Engineering Society of North America (IES) current standard for calculating the life of an LED as the point at which the LED reaches 30 percent lumen depreciation.

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