Showing posts with label LED Lighting. Show all posts
Showing posts with label LED Lighting. Show all posts

Tuesday, April 1, 2014

LED Fun facts 

Article from: ambientlightingcorp.com/lighting-details/led-fun-facts


Mosquitoes and other bugs don’t buzz around LEDs

If you turn on a regular old fashioned light at nigh you will instantly become a magnet for bugs. LEDs don’t have the same effect on the insect population.  This is because LED bulbs do not emit wavelengths in the UV spectrum which is what the bugs are attracted to.  Think of the old bug zappers with the blue lights, a.k.a and infrared bulbs.

LEDs mimic natural light
LEDs operate in the color temperature range we call “Pure White” (5800 to 6200 Kelvin) providing Full Spectrum Light that is the closest thing to natural sunlight without the harmful UV rays.

LED lights help you to keep food fresher for longer.

LED lights do not emit ultraviolet rays and that is why they are better options for supermarkets, restaurants, and kitchen lighting. However, other light sources, natural and artificial, emit UV rays. Ultra Violet rays decrease nutrient levels in foods. In addition,LED lights do not give-off heat, keeping food fresher for longer.

The highest temperature good quality LEDs will reach is around 131 degrees compared with Halogens which get to more than 734 degree

LEDs don’t get hot

The highest temperature good quality LEDs will reach is around 131 degrees compared with Halogens which get to more than 734 degree

LEDs don’t create harmful ElectroMagnetic Fields

LEDs operate on DC (Direct Current), meaning electric current flows in one direction only, creating a static electromagnetic field (EMF). Static EMFs are not linked to the health issues associated with AC lights and appliances.

LEDs don’t get hot

The highest temperature good quality LEDs will reach is around 131 degrees compared with Halogens which get to more than 734 degree

LEDs don’t create harmful ElectroMagnetic Fields

LEDs operate on DC (Direct Current), meaning electric current flows in one direction only, creating a static electromagnetic field (EMF). Static EMFs are not linked to the health issues associated with AC lights and appliances.

LEDs have been around for a long time

The first LEDs were infrared. They were
developed in 1955. White light LEDs were not developed around 1995.  The regular light bub was invented in the 19th century

LED lights help you become a safer driver

Thinking about how it does that. LED headlights have a higher color temperature, which improves the vision of the driver in low-light conditions. Also, the amount of blue light in LED, aids with peripheral vision.

LED stands for Light Emitting Diodes

They are actually not bulbs.  An LED is a semiconductor diode. It consists of a chip of semiconducting material treated to create a structure called a p-n (positive-negative) junction. LEDs have no filament or moving parts, making them extremely durable and low maintenance.

Some advantages of LED Lighting


Basic advantages of LED Light

  • Energy efficient - LED’s are now capable of outputting 135 lumens/watt
  • Long Lifetime - 50,000 hours or more if properly engineered
  • Rugged - LED’s are also called “Solid State Lighting (SSL) as they are made of solid material with no filament or tube or bulb to break
  • No warm-up period - LED’s light instantly – in nanoseconds
  • Not affected by cold temperatures - LED’s “like” low temperatures and will startup even in subzero weather
  • Directional - With LED’s you can direct the light where you want it, thus no light is wasted
  • Excellent Color Rendering - LED’s do not wash out colors like other light sources such as fluorescents, making them perfect for displays and retail applications
  • Environmentally friendly - LED’s contain no mercury or other hazardous substances
  • Controllable - LED’s can be controlled for brightness and color


Why LED's are chosen for many applications
  • LEDs are ideal for use in applications that are subject to frequent on-off cycling, unlike fluorescent lamps that burn out more quickly when cycled frequently, or HID lamps that require a long time before restarting.


  • LEDs can very easily be dimmed or strobed.
  • LEDs light up very quickly. A typical red indicator LED will achieve full brightness in microseconds.
  • LEDs mostly fail by dimming over time, rather than the abrupt burn-out of incandescent bulbs
  • LEDs, being solid state components, are difficult to damage with external shock, unlike fluorescent and incandescent bulbs which are fragile.
  • LEDs can be very small and are easily populated onto printed circuit boards.
  • LEDs do not contain mercury, unlike compact fluorescent lamps
  • Disadvantages and challenges in using LEDs


LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than more conventional lighting technologies. However, when considering the total cost of ownership (including energy and maintenance costs), LEDs far surpass incandescent or halogen sources and begin to threaten compact fluorescent lamps.
The Chart Below compares different light sources based upon the life of the bulb and the electrical cost at 10 cents per kWh (kilowatt hour). Note: fixture costs and installation costs are not included.

LED performance largely depends on correctly engineering the fixture to manage the heat generated by
the LED, which causes deterioration of the LED chip itself. Over-driving the LED or not engineering the product to manage heat in high ambient temperatures may result in overheating of the LED package, eventually leading to device failure. Adequate heat-sinking is required to maintain long life. The most common design of a heat sink is a metal device with many fins, which conducts the heat away from the LED. For more information on this, refer to the Thermal Management tab.
LEDs must be supplied with the correct voltage and current at a constant flow. This requires some electronics expertise to design the electronic drivers.
LED’s can shift color due to age and temperature.  Also two different white LED will have two different color characteristics, which affect how the light is perceived.

LEDs were first used for signal lighting, such as in a dashboard and later in tail lamps. In the past few years several companies have developed high power LEDs which are extremely bright and can now be used in applications that require a high light output, such as street lighting and task lighting. These are often referred to as "lighting class LEDs."

INTRODUCTION TO THREE TYPES OF LIGHTING

INTRODUCTION TO THREE TYPES OF LIGHTING

There are three basic types of lighting: ambient, accent, and task. While it's not required that every space have all three types present, the best lit rooms and spaces will. The best designs will integrate layers of light to create moods and draw the eye to key points of interest. It’s not just recessed cans, it’s not just table lamps, it’s not just accent lighting; it’s the integration of these sources to create a balanced design.

Note that often decorative lighting is considered a 4th type of lighting. Personally, I don't consider lighting that is purely decorative to be part of a lighting scheme. A purely decorative source (that doesn't produce ambient light) is really a piece of art.

CREATING AMBIENT LIGHT

Sometimes referred to as "general lighting," this is the primary lighting element of the room. Ambient lighting will determine the look and feel of the space; think of it as your overall illumination, although that doesn't mean you need to light every corner of the room. Ambient light is the primary lighting choice, and all others fall in around that.

Ambient lighting is commonly created using:

Reflected Light
Recessed Downlights
Concept section - recessed down light.

The recessed downlight (commonly referred to as a high hat) became popular in the 1980s and remains a staple of interior design. Recessed into the ceiling, they create a hole flush with the ceiling plane from which light pours downward. Recessed downlights are capable of accepting compact fluorescent and halogen A-lamps, as well as a wide variety of halogen and LED point sources. CFL and Halogen A-lamps in recessed downlights are truly down lights. Point sources in recessed cans can be aimed (more on that soon).

Since recessed downlights are installed in your ceiling, there are some things to consider (these will apply to their adjustable cousins as well). In the U.S., all electrical connections must be protected within a junction box. So recessed down lights have some version of a housing, and it is within that housing that the electrician will make their wiring connections. Whether you’re building the room as new construction or a renovation, the space between your ceiling and the structure above and whether the ceiling is insulated will all determine what kind of housing is required.

The last thing to consider is what the fixture will look like in your ceiling and how easy it will be to change light bulbs when the time comes. Manufactures have come up with a wide variety of ways to finish the hole created in the ceiling so that the fixture becomes a true architectural element. Usually, these treatments are called trims. A trim is a plate (options include square, round, overlapping the ceiling, flush to the ceiling, deep regress, shallow regress, lensed, all in a multitude of colors, etc.) that will be removed to change a light bulb. It’s important to understand how trims are installed and removed, because these fixtures will have to be maintained over time, even if it’s just changing light bulbs.

Recessed downlights are great for providing illumination, but be careful: The tendency with these is to use too many and over-light the room. Downlight isn't the most complimentary angle to light people or objects; good for general ambiance, yes, but don't rely too heavily on this concept.


Table and Floor Lamps

No surprise here: Table and floor lamps have been a staple since the kerosene era. Most older table and floor lamps are based around incandescent bulbs (refer back to Part I for the various replacements to the A-lamp including CFL, LED and halogen). People often ask me if there's a problem only lighting a room with table and floor lamps, and there isn't. It's just important to understand that table and floor lamps offer only ambient light. Usually, a glow cast in all directions all the time; if that's the effect you want, then that's great. The right lamps with the right light source can make a room magical. At the same time, table and floor lamps are often a fallback when other ideas seem too daunting. Don't fall into that trap.

Cove Lighting

One of the most underused lighting concepts in residential lighting is the cove light. Ambient cove lighting can provide a spectacular indirect light source for your room. If the architecture supports it,
think about coves as a way to bounce light off your ceiling, or wash light down your walls. Cove lighting can be achieved with linear and compact fluorescent, halogen strips, and increasingly with LEDS. Cove lighting is especially great for creating luminous surfaces, like walls in a bathroom or vaulted ceilings in an older home. Make sure you understand the design of cove lighting so you can ensure proper maintenance.

Surface Mounted Decorative Fixtures
These are fixtures mounted tight to walls and ceilings and are meant to be viewed. Surface mounted fixtures can be amazing when they fit with the decor and provide the desired lighting effect. Here's my cautionary note with surface mounted fixtures: Big box stores that shall remain unnamed have pushed lots of sub-par fixtures into the market. Don't get me wrong; you can find a decent fixture at your local big box retailer, but if you're looking for great lighting, do your research.

There are amazing fixtures from all over the country that are works of art in and of themselves and will dramatically improve the execution of your design. Look at photos online and go to shops if you can, because finding the right fixture can change everything.

Chandeliers and Wall Sconces

The mother of all decorative fixtures, a chandelier can be utterly spectacular. When the word is uttered,
most people think of a crystal piece with dozens of tiny lamps. I invite you to expand your concept of what a chandelier is to modern forms and singular light sources. I think of a chandelier as any hanging light source that is some height below the ceiling. Like other decorative sources, expand your thinking from what's available at the local big box store; I've seen chandeliers made of used spoons, hubcaps, and painted glass. Chandeliers can be totally expressive pieces of art as well as good ambient light sources.

Wall sconces are decorative pieces mounted at some distance off the wall. There are as many kinds of sconces as there are kinds of taste. When walls themselves become luminous,  good things can happen. Good sconces, like table and floor lamps provide ambient light from a relatively low angle. This soft glow creates complimentary shadows on the faces of people and furniture. Light from lower
angles (though not uplight from the floor) will also be perceived as warmer and more inviting.

Basic Types Of Lighting



 Basic Types Of Lighting

Ambient lighting provides an area with overall
illumination. Also known as general lighting, it radiates a comfortable level of brightness without glare and allows you to see and walk about safely. In some spaces such as laundry rooms, the ambient lighting also serves as the primary source of task lighting.

It can be accomplished with chandeliers, ceiling or wall-mounted fixtures, recessed or track lights and with lanterns mounted on the outside of the home. Having a central source of ambient light in all rooms is fundamental to a good lighting plan.

Task lighting helps you perform specific tasks, such as reading, grooming, preparing and cooking food, doing homework, working on hobbies,

playing games and balancing your check-book. It can be provided by recessed and track lighting, pendant lighting and under-cabinet lighting, as well as by portable floor and desk lamps.

Task lighting should be free of distracting glare and shadows and should be bright enough to prevent eye strain.

Accent lighting adds drama to a room by creating visual interest. As part of an interior design scheme, it is used to draw the eye to houseplants, paintings, sculptures and other prized possessions. It can also be used to highlight the texture of a brick or stone wall, window treatments or outdoor landscaping.

To be effective, accent lighting requires as least three times as much light on the focal point as the general lighting surrounding it.

Accent lighting is usually provided by recessed and track lighting or wall-mounted picture lights.