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    Frequently Asked Questions

    <br><p style="text-align: center; font-size: 14px; font-weight: bold;">Frequently Asked Questions</p>
    <br>
    <ul style="color: green; text-align:left;">
    <li><a href="#1" style="font-size: 9pt; line-height: 1.5;">Does turning a LED light on and off shorten the bulb life?</a></li>
    <li><a href="#2" style="font-size: 9pt; line-height: 1.5;">Do LED light bulbs come on instantly or do they have a delay like compact fluorescent lights (CFLs)?</a></li>
    <li><a href="#3" style="font-size: 9pt; line-height: 1.5;">Where are the best places to put LEDs in my home or business?</a></li>
    <li><a href="#4" style="font-size: 9pt; line-height: 1.5;">Can all LED lighting be dimmed or used with dimmer switches?</a></li>
    <li><a href="#5" style="font-size: 9pt; line-height: 1.5;">How come some LED lights last longer than others?</a></li>
    <li><a href="#6" style="font-size: 9pt; line-height: 1.5;">What about using LED lighting in fully enclosed housings?</a></li>
    <li><a href="#7" style="font-size: 9pt; line-height: 1.5;">What does Color Temperature (CT) or Correlated Color Temperature (CCT) refer to?</a></li>
    <li><a href="#8" style="font-size: 9pt; line-height: 1.5;">Do LED bulbs emit UV and IR radiation?</a></li>
    <li><a href="#9" style="font-size: 9pt; line-height: 1.5;">What does Beam Angle refer to?</a></li>
    <li><a href="#10" style="font-size: 9pt; line-height: 1.5;">What is a lumen?</a></li>
    <li><a href="#11" style="font-size: 9pt; line-height: 1.5;">What is the Color Rendering Index (CRI)?</a></li>
    <li><a href="#12" style="font-size: 9pt; line-height: 1.5;">Is LED lighting suitable for damp or wet locations?</a></li>
    </ul>
    <br>
    <p class="question"><a id="anchor" name="1"></a>Does it shorten the life
    of an LED bulb to turn it off and on?</p>

    <p class="answer">No, unlike fluorescent
    bulbs, LED lighting is not affected by being turned on or off.</p><br>

    <p class="question"><a id="anchor" name="2"></a>Do LED light bulbs come
    on instantly or do they have a delay like compact fluorescent lights (CFLs)?</p>

    <p class="answer">Most LED lights switch
    on instantly at full brightness just like incandescent or halogen bulbs.&nbsp;They do not suffer from the “blooming” effect
    of CFL bulbs.</p><br>

    <p class="question"><a id="anchor" name="3"></a>Where are the best
    places to put LEDs in my home or business?</p>

    <p class="answer">For the quickest return
    on investment one should look for locations where the lights are left on the
    longest amount of time.&nbsp;These areas usually
    include the kitchen, common spaces, outdoor security lights, office hallways
    and lobbies.&nbsp; Due to their long life, LED lights are also ideal for hard
    to reach spots like high ceilings cans or track lights.&nbsp; From a quality of
    light standpoint, LED lights offer a very energy efficient dimmable light with
    a high color rendering index number.</p><br>

    <p class="question"><a id="anchor" name="4"></a>Can all LED lighting be dimmed
    or used with dimmer switches?</p>

    <p class="answer">The quick answer is no,
    not all LED lighting can be used with dimmer switches.&nbsp;Make sure to buy a LED light bulb or light
    fixture that specifically states on the packaging, or within the product
    description, that it’s dimmable.&nbsp;Also,
    be sure to look at any additional requirements the lights may have in order to
    dim properly.&nbsp;This may include using low
    voltage electronic or magnetic dimmers or making sure to have enough LED light
    bulbs on a dimmer so that the lights dim to their lowest possible setting.&nbsp;The dimmer switch you already have may work
    great, but be prepared for the possibility that another type of dimmer switch
    may work better. For more information, please see our <a href="/Dimming-LEDs_ep_47.html" alt="Dimming LED Bulbs" style="color: blue; text-decoration: underline;">Dimming LED Lighting article</a>.</p><br>

    <p class="question"><a id="anchor" name="5"></a>How come some LED lights
    last longer than others?</p>

    <p class="answer">All light bulbs suffer
    from a diminished amount of light output over time.&nbsp;However, unlike incandescent light bulbs, LED
    light bulbs don’t typically fail completely but continue to lose brightness
    over thousands of hours. The industry considers an LED light bulb’s life span
    to be over when it reaches 70% of its initial brightness.&nbsp; Most well designed
    LED lights will last 25,000 to 50,000 hours. The actual lifespan of an LED
    light depends on several factors.&nbsp; Heat is produced around the LED chip
    and causes an accelerated decrease in the life and performance of an LED light
    if not dealt with properly.&nbsp; A well designed LED light will have high
    quality components designed to move the heat generated by the LEDs away from
    the LED itself.&nbsp; Also, some lesser quality LED bulb makers overdrive the LED
    inside the bulb with more electrical current than they are designed to
    handle.&nbsp; This will yield more initial brightness from the LEDs but results
    in a shortened lifespan and shifts in color temperature.&nbsp; WARNING:&nbsp;
    Manufacturer’s who claim 100,000 + hours for their LED lights are publishing a
    half truth because they are typically making claims based on lab tests of the LED
    chip itself and not the LED light bulb or LED fixture as a whole!</p><br>

    <p class="question"><a id="anchor" name="6"></a>What about using LED lighting in fully enclosed housings?</p>

    <p class="answer">As mentioned in the previous question, LED light bulbs do not like excessive heat particularly around the LED chip and circuitry. Operating LED bulbs in tightly enclosed spaces results in higher ambient temperatures and reduces the ability of the bulbs to dissapate heat.  This may result in a dramatic decrease of bulb life and shifts in color temperature of the light being produced.  If possible, always try to provide some means of airflow to allow for convective cooling around the LED bulb.  Many LED bulb manufacturers include product labeling stating that their bulbs are not for use in totally enclosed fixtures and that doing so will void the warranty on these products.</p><br>

    <p class="question"><a id="anchor" name="7"></a>What does Color Temperature
    (CT) or Correlated Color Temperature (CCT) refer to?</p>

    <p class="answer">LED lighting is available
    in a wide range of color temperatures from the warm yellow color of an
    incandescent bulb to the neutral color of a halogen to a cool blue color
    similar to a bright but overcast day. We recommend familiarizing yourself with
    the color temperature scale used to define what hue of light a specific LED bulb
    emits. &nbsp;Color temperature is based on the
    Kelvin temperature scale, measured in degrees, and ranges from 2600°K on the low
    end to over 6000°K on the high end for most lighting applications.&nbsp;Most home applications should utilize
    lighting with a CCT at or below 4000°K.&nbsp; Light emitted above 3500°K is
    popular for commercial environments or very modern decors that seek to
    reproduce a daylight look.</p>
    <p style="text-align: center;"><img src="/assets/images/WebGraphics/Color-Temperature-Spectrum.jpg" alt="Correlated Color Temperature" width="533" height="253"></p><br>

    <p class="question"><a id="anchor" name="8"></a>Do LED bulbs emit UV and IR radiation?</p>

    <p class="answer">Most LED bulbs produce a "cold" beam that contains only visible light.   In other words, no ultraviolet (UV) or infrared (IR) light is emitted.  There are several advantages to using a light that only emits electromagnetic radiation in the visible spectrum, as a light withouth UV or IR will not fade colors, degrade artwork or radiate thermal energy (heat) in the beam.  This makes LED lighting an ideal candidate for retail shops, galleries and museums, all of which need lighting with good color rendering and that won't adversely affect the merchandise or art displays. </p><br>

    <p class="question"><a id="anchor" name="9"></a>What does Beam Angle refer to?</p>

    <p class="answer">Knowing the beam angle of a light bulb helps to
    ensure that you’re buying a product which will give you adequate lighting in a
    particular application. Light bulbs are often referred to as ‘spotlights’ or ‘floodlights’,
    and while these terms do relate to beam angle, they still leave some ambiguity
    due to the wide variation of bulbs that fall into each particular category.&nbsp;For instance, one floodlight bulb may have a
    beam angle of 30° while another may have a beam angle of 75°.&nbsp;Quite a difference!&nbsp;Beam angle specifically refers to the angle
    at which the light output has been reduced to 50% of the maximum center beam brightness.
    For instance, let’s say a PAR30 LED light bulb has a center beam candlepower
    measurement of 800.&nbsp;If at 30° to one
    side of the beam the candlepower has dropped to 400 then we know that the beam
    angle is 60° (see diagram below).&nbsp;It's best to buy
    spotlight bulbs when trying to highlight a particular object or concentrate
    light in a smaller area.&nbsp;Use floodlight
    bulbs when trying to achieve more general illumination, such as in recessed
    downlighting.</p>
    <p style="text-align: center;"><img src="/assets/images/WebGraphics/Beam-Angle.jpg" alt="Light Bulb Beam Angle" width="500" height="442"></p><br>

    <p class="question"><a id="anchor" name="10"></a>What is a lumen?</p>

    <p class="answer">In layman’s terms, lumens are a measurement of light
    output.&nbsp;The technical definition goes
    beyond the scope of our frequently asked questions, but the fact is that knowing
    something about the lumen is becoming much more important as we move away from
    using traditional light bulbs.&nbsp;With
    incandescent lighting most people are used to associating brightness with certain
    wattages (i.e. a 100W bulb is brighter than a 75W bulb), but wattage is really
    a measurement of the power required to light the bulb and not a measurement of
    light output.&nbsp;A 60 watt incandescent
    bulb produces about 800 lumens of light and yet an LED bulb can output the same
    amount of light using 12 watts or less.&nbsp;It’s
    the lumens that are really important here, and the less wattage it takes to supply a
    given amount of light the better and more efficient your lighting really is. &nbsp;In the near future most types of light bulbs
    will require the lumen output to be listed on the bulb packaging.&nbsp;This will make it much easier to compare
    different types of lighting and how efficient they are.</p><br>

    <p class="question"><a id="anchor" name="11"></a>What is the Color Rendering Index (CRI)?</p>

    <p class="answer">The Color Rendering Index is a measurement of how
    accurate certain colors look when viewed under the light from a particular
    light source as compared to an ideal or natural light source radiating at the same
    color temperature.&nbsp;The CRI of a bulb
    does not relate to the color of light the bulb produces.&nbsp;That falls under the Color Temperature measurement
    (see above).&nbsp;The index scale ranges from
    0-100 with 100 being a perfect score.&nbsp;There
    is some discussion in the lighting world that CRI will not accurately reflect the
    ability of new lighting technologies to render colors properly and new methods are
    being looked at for measuring this component of lighting.&nbsp;It can certainly happen that people may think
    colors look more accurate to their eye under a light source with a lower CRI
    than one with a higher CRI. When it comes to LED lighting the current
    recommendation is to purchase products with a CRI of 80 or higher.&nbsp;</p><br>

    <p class="question"><a id="anchor" name="12"></a>Is LED lighting suitable for damp or wet locations?</p>

    <p class="answer">Many LED lighting products are UL listed as 'Damp Rated' or 'Wet Rated' and can be used in locations where moisture has the possibility of condensing or coming in direct contact with the light.  Just what do all the different UL environmental location markings mean?  We're glad you asked.  Here's the answer from the the UL Marking Guide for Luminaires:<br>
    <blockquote style="color:black">1. DRY LOCATIONS — A luminaire intended for use in a location not normally subject to
    dampness, but may include a location subject to temporary dampness, as in the case of a
    building under construction, provided ventilation is adequate to prevent an accumulation of
    moisture is marked “DRY LOCATIONS ONLY.”<br><br>
    2. DAMP LOCATIONS — Only luminaires marked “SUITABLE FOR DAMP LOCATIONS” or
    “SUITABLE FOR WET LOCATIONS” are intended to be installed in damp locations. A damp
    location is an exterior or interior location that is normally or periodically subject to condensation
    of moisture in, on, or adjacent to, electrical equipment, and includes partially protected
    locations.<br><br>
    3. WET LOCATIONS —- Only luminaires marked “SUITABLE FOR WET LOCATIONS” are
    intended to be installed in wet locations. A wet location is a location in which water or other
    liquids may drip, splash or flow on or against electrical equipment. A luminaire marked
    “SUITABLE FOR WET LOCATIONS” may be additionally marked as specified below:<br><br>
    a. Covered Ceiling Mount Only — A wet locations luminaire marked “COVERED
    CEILING MOUNT ONLY” is intended for locations such as a vehicle washing area
    where the luminaire will not be subjected to water and precipitation from the back side. A
    ceiling mounted luminaire not identified for covered ceiling mount only is suitable for
    mounting in locations where it may be subjected to precipitation from the back side, such
    as under a metal grate-type catwalk.<br><br>
    b. Less Than 1.2 M (4 Feet) Above Ground Level — A wet locations wall or post
    mounted luminaire may be installed within 1.2 m (4 feet) of ground level if it is marked
    “SUITABLE FOR MOUNTING WITHIN 1.2 M (4 FEET) OF GROUND.” luminaires with
    this marking are intended to be subjected to water from lawn and garden sprinkler
    systems, but are not intended to be installed at or below ground level where they may be
    subjected to immersion in water.<br><br>
    Exception: A luminaire with an integral post (bollard type luminaire) needs to be so
    marked.<br><br>
    c. Below Ground Level — A wet locations recessed luminaire may be installed at or
    below ground level if it’s marked “SUITABLE FOR GROUND-MOUNTED RECESSED.”
    A luminaire with this marking is intended to be subjected to infrequent immersion under
    water which may occur because of heavy precipitation. The luminaire is provided with
    instructions for its proper installation.</blockquote>
    </p>