Sunday, September 28, 2014

What's CRI All About?


The CRI refers to the Colour Rendering Index (sometimes referred to as Colour Accuracy). This is the level to which a light source can duplicate colors produced by a reference light source (usually the sun). It is measured as a number between 0 and 100. A light fixture with CRI of 100 means that colours will appear exactly as they would under normal midday sunlight conditions, like an incandescent or halogen bulb.



A CRI of 80 means that the LED light bulb is replicating 80% of the visible color spectrum that the sun would produce at the same colour temperature. A CRI of 100, taken at a colour temperature of midday sunlight will exactly reproduce the colours found on a sunny day at noon. A CRI of 50 taken at midday sun will somewhat reproduce the colours when compared to that of a normal midday sunlight.

Some manufacturers (in a bid to attain a CRI of 100) use a non-midday colour temperature as their source CRI, therefore when calculating the CRI of their fixtures; it appears higher than it actually is (and therefore more impressive).


Currently (using the midday Sun as our light source) Astera’s SpotMax™ can achieve a CRI of approximately 87, which is incredibly high for a wireless, RGBAW fixture. A CRI of between 90 and 95 is achievable with an LED light source, but as yet is not commercially available.


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Astera LED Technology

Monday, September 22, 2014

Let's Talk Uplighting

Let's Talk Uplighting


As the name suggests, uplighting is the art of using light (in an upwards direction) to wash your walls with colour, and in the process turn a plain and unexciting venue into a buzzing and colourful event.

LED or Traditional PAR Can?

There are many benefits to using LED lights compared to traditional PAR cans for your uplighting. The main attraction is that LEDs use much less power than traditional bulbs, and they rarely overheat or pose a fire hazard. Their color, effects, settings and brightness can be wirelessly changed as and when it is needed, as opposed to traditional PAR cans, which need their filter gels changed each time you wish to illuminate in a new colour. LED lights also do not require a bulky and time-consuming DMX controller to switch them on or off. Instead, LED lights come with various forms of remote control and most are fitted with Wireless DMX capabilities.

The main drawback to using LED lights is that it’s more expensive, but that is much less of an issue now than it was before due to the high demand for LED event lighting. Another drawback was that LEDs were not as bright as traditional PAR can lights, but that is also no longer the case.

Photo credit: Paul Singh, Midwest Sound

Wired LED Uplighting or Wireless LED Uplighting?

Most of the options for uplighting currently on the market are wired solutions. These have been in production for many years and users are very familiar with these lights (controlled by DMX and connected to the mains). They are bright, rigid, cheap and long-lasting. For the traditional and price conscious DJs and event designers, these are perfect. However, there are also wireless options available. This is a technology with much less history and with fewer options available.

The benefit of wireless lighting over wired options is the set-up time and the event aesthetic. In general, it takes considerably less time to set-up events with wireless lights, and with that comes the need for less man power. For modern, price sensitive, shrewd business owners, while initially more expensive, wireless lights definitely pay off very quickly due to the cost savings in other areas. Not to mention the impact wireless lights will have on your event. Without cables in show, running along walls, hanging from ceilings etc., events can look clean and tidy and really make a professional impression on your clients.



Types of Uplighting

Simplifying the topic, it is possible to make two categories for uplighting. Each category uses the light and effects differently to elicit different moods and reactions from your guests.

Ambient Uplighting

Ambient uplighting is used with the aim of improving the graceful atmosphere of a room or event. With this type of uplighting, the lights are being used to complement the space, create an aura, and not as a glitzy performance in and of itself. Generally, ambient uplighting is characterized by its use of static colours (you pick one color and it stays the same for an extended period of time) or multiple colours but with very little movement (remember, the idea is to create mood, not excitement). There are also different types of ambient uplighting. To light up a pillar or a piece of furniture is typically to use accent lighting (to accentuate the object), but to paint a wall with colour is to use mood lighting.

Flashy Uplighting

Flashy uplighting is intended to provoke the senses of the crowd and get noticed. Typically, events that wish to have a temporary dance floor will make use of flashy uplighting with lots of movement, different effects, frequently changing colours, and even possibly a strobe effect.

Both types of uplighting are difficult to achieve but both are very successful when correctly utilized. Uplighting can be used at any venue where you feel a mood needs to be set, but you will most likely see uplighting at wedding receptions, corporate events, and other celebration parties.


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Astera LED Technology

Monday, September 15, 2014

Wireless Weddings

Wireless Weddings


How can wireless lighting benefit weddings? Does it make sense to use wireless lighting, which is typically more expensive, for your clients’ big day? Here is a list of the advantages of wireless weddings:


TABLE CENTERPIECES

Every wedding has large tables, and that requires stunning centerpieces. With wireless lighting, you can place a colour-changing ornament in the center, which can also be synched with all the other tables to change colour and effect at the same time. Furthermore, this is only really plausible with wireless lighting since it’s seamless and doesn’t require cables, which can look hideous on a day where everything must be perfect.

Recommended Astera Products: AX3 Lightdrop™ and AL3-S MiniLightdrop™

These two products are small, compact and have long battery runtimes. They can be used with Astera centerpieces (bubble stick and small spheres) or be built into your own construction. No cables, and being very small, make this a possibility. The great thing is that you can just use the AX3 and place a clear glass vase on top and “hey presto!”… You have a nice and quick centerpiece.


QUICK SET UP

Since wedding venues are usually only rented for one day, there is always a mad rush to get everything set up and rigged in time. This is where wireless lighting can help tremendously. Less cables means less staff needed to lay the cables, transport equipment and to maintain/program the equipment to play desired effects. Saving time means you need less rental time, and also less pack-up time. These are all going to impact your profit margins, whether you’re a mobile DJ or a fully-fledged event company.

Recommended Astera Products: AX7 SpotLite™ and AX10 SpotMax™

These lights not only have tons of effects to choose from, with lovely rich colours, they are also waterproof which is ideal for outdoor weddings in places where there are no power outlets (on the beach, for example). Furthermore, wireless lights can constantly be tweaked and moved within seconds to find the optimal angle for illumination (for example, when lighting up trees and buldings).


FLAWLESS APPEARANCE

Much the same as the two previous benefits, but when lighting up walls with wallwasher fixtures, cables are even more prominent and they really restrict the movement you can apply to each fixture. For wired set ups, cables are sometimes covered (which takes time) or they are left to be seen (which looks ugly), so when moving a fixture the cables will be disrupted and it takes even more time to conceal them again. With wireless lights, none of these issues are present.

Recommended Astera Products: AL6-M and AL6-L WallwashersAL7-XXL and AX10 SpotMax™



Not only are they wireless, they also come in white for weddings, which allows the lights to fit seamlessly into the overall event aesthetic.



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Astera LED Technology

Tuesday, September 9, 2014

Wireless Lighting

Wireless Lighting



General

For a light to be wireless, it requires two elements; wireless power and wireless control. There are many types of wireless control; radio frequency, infra-red, W-DMX, Bluetooth etc., all with varying operational ranges. In order to control a wireless light, the light fixture must have an antenna, and to power a wireless light, there must be a rechargeable battery/pack within its housing.


Wireless Control

Infra-red (IR) control typically has a short range of approximately 10m. The sub-division of IR used to control wireless lights is known as near-infrared (NIR) and it works on the 0.78-3µm wavelength.

Radio frequency (RF) control has very large range of approximately 300m. There are many different frequencies in the radio spectrum. Astera works on the ultra-high frequency between 860MHz (EU) and 915MHz (USA), and later will switch to the much more stable 2.4GHz frequency for both regions.

Wireless-DMX control can be achieved by using a wireless DMX transmitter (Astera’s ART3 is suitable) with any standard DMX setup desk. Alternatively, Astera’s X-Series lights can be controlled using CRMX Wireless DMX from Lumen Radio.


Wireless Power

Rechargeable batteries are a requirement of wireless lighting. The longer the charge is held and the more charging cycles the battery has determines the quality of the battery. Many wireless lights (and other consumer electronics) use lithium-ion batteries as they have one of the best energy densities, no memory effect and a slow discharge rate when not in use. Compared to lead acid batteries, lithium-ion batteries are far superior due to the lighter weight and longer use. However, Astera uses lithium-nickel-manganese-cobalt mixed cell batteries, which perfectly combines optimal volumes of each element to considerably lower the energy density and increase the lifespan and safety of the battery.

For the X-Series, Astera uses ultra-long-life Samsung batteries to support the extremely bright Cree and Philips LEDs being used. These LEDs require more power to prolong the fixtures’ runtime.


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Astera LED Technology

Thursday, September 4, 2014

What is an LED?

What is an LED?


Let's start off with the basics..

General


An LED is a Light Emitting Diode. A diode is a semiconductor device that only allows electrical current to flow in one direction. An LED works by a process called electroluminescence. Inside an LED, there are two regions, a P region (with positively charged holes) and an N region (with negative electrons). Where these regions meet is called the PN junction. When enough voltage is passed through the device, negatively charged electrons can eventually pass the junction and meet with positively charged holes. Their combination releases electromagnetic energy in the form of a photon of light.

Color Creation

The color of an LED is created by the LED itself without gels or filters. The material of the semiconductor defines the color of the light emitted. LEDs produce monochromatic light (single wavelength) colors, and only red, blue, green, amber and several whites can be created. A cold white LED is actually a blue LED with a special phosphor coating to mix down-converted yellow light with blue to produce light that appears white. A warm white LED is created in much the same way but with red and white emitting phosphors.

Most perceivable colors can be created by mixing varying amounts of the three primary colors (red, green and blue). LEDs are now made with not only one color ability. RGB LEDs, with four pins entering the transparent plastic case instead of the traditional two pins, can realize more colors from one LED. Commonly seven colors can be produced by controlling the switch of the channel for each primary color. However, to produce more than seven colors, each channel must be controllable in brightness.


Life Cycle

Typically, LEDs last for approximately 50,000 hours, by which point they will be at 70% brightness. LEDs, especially high-power LEDs, get extremely hot, and this causes their life expectancy to drop. However, creatively engineered light fixtures integrate heat sinks into the product design in order to keep the LEDs cool and preserve their lifespan.


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Astera LED Technology