Mcd Blue
Todays deals on Mcd Blue?
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1000 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $892.79 |
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1000 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $883.49 |
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1000 PCS 10mm 40° 1W Watt Blue LED 300mA 250,000mcd!NEW $816.99 |
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1000 PCS 10mm 40° 1W Watt Blue LED 300mA 250,000mcd!NEW $812.69 |
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500 PCs HP 1W 8mm 140° StrawHat 450nm BLUE LED 140,000mcd $799.69 |
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500 PCs 10mm 40° 1W Watt 450nm Blue LED 300mA 220,000mcd $739.50 |
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10000,PLCC-2 3528 (1210) BLUE 950mcd SMD LED Light,PBS $688.00 |
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20000pcs 5mm Blue 10000 MCD water clear led lamp.LED’S $550.00 |
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10000,5mm Blue Color Led Bright 6000–8000MCD LED’S, B5 $495.00 |
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PKG5000,Super Bright 6000MCD 10mm Blue LED,3.2V-3.4V $478.00 |
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PKG5000,Super Bright 6000MCD 10mm Blue LED,3.2V-3.4V $478.00 |
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PKG5000,Super Bright 6000MCD 10mm Blue LED,3.2V-3.4V $478.00 |
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500 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $471.50 |
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10000 pcs 3mm Blue LED Lamp 8000mcd & Free Resistors $469.99 |
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10000 pcs 5mm Blue LED Lamp 8000mcd & Free Resistors $469.99 |
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10000 pcs 5mm Blue LED Lamp 8000mcd & Free Resistors $469.99 |
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10000 pcs 3mm Blue LED Lamp 8000mcd & Free Resistors $469.99 |
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500 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $464.99 |
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Lot of 10000 X 3mm Blue LED 10000mcd Free Resistors $458.00 |
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Lot of 10000 X 5mm Blue LED 10000 mcd Free Resistors $458.00 |
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1000 PCS PLCC-6 3-CHIPS POWER SMD SMT 5000 mcd BLUE LED $449.99 |
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Lot of 10000 X 3mm Blue LED 10000mcd Free Resistors $439.00 |
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Lot of 10000 X 5mm Blue LED 10000 mcd Free Resistors $439.00 |
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500 PCS 10mm 40° 1W Watt Blue LED 300mA 250,000mcd!NEW! $429.99 |
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500 PCS 10mm 40° 1W Watt Blue LED 300mA 250,000mcd!NEW! $425.69 |
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New Product 500 PCS 10mm 40° Blue LED 250,000mcd $412.00 |
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NEW 500 PCS 1W 8mm 140° StrawHat Blue LED 160,000mcd $412.00 |
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5000p 5mm SUPER BRIGHT BLUE LED 10,000mcd FREE RESISTOR $399.99 |
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5000p 3mm MegaBright BLUE LED LIGHT 10,000mcd+ RESISTOR $399.99 |
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5000p 4.8mm BLUE LED LAMP LIGHT 10,000mcd FREE RESISTOR $399.99 |
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1000 PC 10mm 40° 0.5W 5-Chips Blue LED 100mA 170,000mcd $361.76 |
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1000 PC 10mm 40° 0.5W 5-Chips Blue LED 100mA 170,000mcd $358.04 |
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5000pcs x 5mm blue + 5000pcs x 5mm white 8000mcd LED $350.55 |
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5000pcs x 5mm blue + 5000pcs x 5mm white 8000mcd LED $350.55 |
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5000pcs x 5mm blue + 5000pcs x 5mm white 8000mcd LED $350.55 |
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5000pcs x 5mm blue + 5000pcs x 5mm white 8000mcd LED $350.55 |
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10000,5mm Blue 10000mcd Super Bright Water Clear LED’S $341.00 |
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10000,5mm Blue 10000mcd Super Bright Water Clear LED’S $339.00 |
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10000PCS 5mm Blue 10000 MCD water clear led lamp.LED’S $338.00 |
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5000pcs x 5mm blue + 5000pcs x 5mm white 8000mcd LED $338.00 |
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10000PCS 5mm Blue 10000 MCD water clear led lamp.LED’S $338.00 |
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10000PCS 5mm Blue 10000 MCD water clear led lamp.LED’S $338.00 |
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200 PCs HP 1W 8mm 140° StrawHat 450nm BLUE LED 140,000mcd $334.69 |
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5000pcs x 3mm blue + 5000pcs x 3mm white 8000mcd LED $328.00 |
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5000pcs x 3mm blue + 5000pcs x 3mm white 8000mcd LED $322.00 |
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10x1000pcs,5mm BLUE 8000MCD SUPER BRIGHT LED FREE SHIP $318.00 |
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10x1000pcs,5mm BLUE 8000MCD SUPER BRIGHT LED FREE SHIP $318.00 |
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10x1000pcs,5mm BLUE 8000MCD SUPER BRIGHT LED FREE SHIP $318.00 |
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New 0603 blue smd leds 4000pcs 1 roll 300MCD $299.99 |
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200 PCs 10mm 40° 1W Watt 450nm Blue LED 300mA 220,000mcd $309.50 |
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10000PCS,3mm Blue 10000 MCD water clear led lamp.LED’S $302.00 |
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1000 PCS 3mm 10000mcd Super Flux Blue Led Free Resistor $299.99 |
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2000p 8mm BLUE LED LAMP LIGHT 40,000mcd FREE RESISTOR $299.99 |
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10000PCS,3mm Blue 10000 MCD water clear led lamp.LED’S $299.00 |
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300 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $296.66 |
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300 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $292.94 |
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New Product 300 PCS 10mm 40° Blue LED 250,000mcd $275.00 |
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NEW 300 PCS 1W 8mm 140° StrawHat Blue LED 160,000mcd $275.00 |
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1000 PCS Mega Bright Blue LED 10mm 70,000 mcd F/R $244.99 |
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1000 PCS Mega Bright Blue LED 10mm 70,000 mcd F/R $274.99 |
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1000p 10mm MEGA BRIGHT BLUE LED 40,000mcd FREE RESISTOR $268.99 |
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5000,5mm Blue Color Led Super Bright 6000 – 8000mcd,BB5 $265.55 |
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5000,5mm Blue Color Led Super Bright 6000 – 8000mcd,BB5 $265.55 |
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5000,5mm Blue Color Led Super Bright 6000 – 8000mcd,BB5 $265.55 |
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5000 pcs 3mm Blue LED Lamp 8000mcd & Free Resistors $259.99 |
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5000 pcs 5mm Blue LED Lamp 8000mcd & Free Resistors $259.99 |
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5000 pcs 3mm Blue LED Lamp 8000mcd & Free Resistors $259.99 |
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5000 pcs 5mm Blue LED Lamp 8000mcd & Free Resistors $259.99 |
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5000,5mm Blue Color Led Bright 6000 – 8000MCD LED’S, B5 $258.00 |
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5000,3mm Blue Color Super Bright 6000 – 8000MCD LED,B3 $253.00 |
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500 PCS PLCC-6 3-CHIPS POWER SMD SMT 5000 mcd BLUE LED! $249.99 |
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500pcs 5mm 0.5W Blue LED Wide Angle 60° 50,000mcd F/S $248.00 |
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Lot of 5000 X 3mm Blue LED 10000mcd Free Resistors $248.00 |
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Lot of 5000 X 5mm Blue LED 10000 mcd Free Resistors $248.00 |
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Lot of 5000 X 3mm Blue LED 10000mcd Free Resistors $248.00 |
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Lot of 5000 X 5mm Blue LED 10000 mcd Free Resistors $248.00 |
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1000 PCS PLCC-2 3528 POWER TOP SMD 800 mcd BLUE LED!NEW $227.99 |
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1000 PCS PLCC-2 POWER TOP SMD SMT 600 mcd BLUE LED!NEW! $223.19 |
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200 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $213.89 |
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200 PCs 1W 8mm 140° StrawHat Blue LED 170,000mcd@300mA $209.24 |
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1000 PCS 0603 SMT SMD 200-250 mcd BLUE LED Free Ship $200.99 |
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1000 PCS 0805 SMT SMD 600 mcd BLUE LED Free Ship $200.99 |
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1000 PCS 1206 SMT SMD 800 mcd BLUE LED Free Ship $200.99 |
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New Product 200 PCS 10mm 40° Blue LED 250,000mcd $200.00 |
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NEW 200 PCS 1W 8mm 140° StrawHat Blue LED 160,000mcd $200.00 |
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2000p 5mm SUPER BRIGHT BLUE LED 10,000mcd FREE RESISTOR $199.99 |
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6000,5mm White / BLUE 12000mcd Water Clear LED’S Lamp $199.00 |
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1000 PC MegaBright Blue LED 4.8mm 120° 11000mcd!NEW!F/R $198.99 |
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1000 PC MegaBright Blue LED 4.8mm 120° 11000mcd!NEW!F/R $198.99 |
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New 1000pcs 5MM Super Bright Blue LED Lamp 15,000mcd $190.19 |
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4000Pcs New 0603 SMD Blue LED 100mcd $189.99 |
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2000p 3mm MegaBright BLUE LED LIGHT 10,000mcd+ RESISTOR $189.99 |
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2000p 4.8mm BLUE LED LAMP LIGHT 10,000mcd FREE RESISTOR $189.99 |
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5000pcs x 3mm 8000-10000MCD BLUE ULTRA BRIGHT LEDs LED $189.00 |
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NEW 500 PCS 10mm 40° 0.5W 5-Chips Blue LED 160,000mcd! $189.00 |
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5000pcs x 3mm 8000-10000MCD BLUE ULTRA BRIGHT LEDs LED $189.00 |
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5000pcs x 3mm 8000-10000MCD BLUE ULTRA BRIGHT LEDs LED $189.00 |
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500 PC 10mm 40° 0.5W 5-Chips Blue LED 100mA 170,000mcd! $188.78 |
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500PCS x Blue 0.5W 8mm 70.000mcd HP StrawHat LED 140° $186.00 |
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200 PCS 10mm 40° 1W Watt Blue LED 300mA 250,000mcd!NEW! $185.75 |
Mcd Blue Questions
A Guide to Outdoor Video Screens
Big outdoor screens have been used in stadiums, towns centre advertising and are now popular at concerts and outdoor events. Early designs of big screens utilised power hungry halogen lamps. Simpler types used electromechanical pixels. Sony launched their Jumbotron in 1985 using CRT (cathode ray tube) technology.
During the 1990s LED’s (light emitting diodes) started becoming brighter so they could be seen in sunshine, because of this they became the technology of choice. They offered numerous other advantages. LED’s were considerably cheaper, had a much longer lifespan (10 x CRT), offered a much sharper picture and considerably lower power consumption.
First, let me explain some of the basic terminology:
Pixel – an addressable graphic dot. RGB (red, green, blue) – from these colours it is possible to make all the colours and shades.
Pixel composition – the number and colour of LED’s in the pixel. E.g. 2 x red + 1 x green + 1 blue.
Resolution – matrix of pixels, the number of rows x number of columns of pixels. Pitch – the distance between the pixels.
Sharpness – determined by the density of pixels, higher the density the sharper the picture quality.
Brightness – measured in MCD (mill candela) or Nit (unit of luminance equivalent to one candela per square metre (1 cd/m²).
Viewing angle – Typically 120 degree horizontally and 60 degrees vertically.
Compound distance – the minimum distance at which you can view the picture without it appearing too pixilated. For small pitch e.g. 10mm the distance can be 10m, larger pitches e.g. 20mm it can go up to 30m.
Viewing distance – the maximum viewing distance at which text can be read. This is related to character height.
Colours – the millions of combinations generated by lighting the LED’s at various brightness levels and combinations. There are usually 10 bits per colour for grey scale and 256 levels of brightness.
LED life – nowadays 100,000 hours (11+ years) is typical. The brightness reduces to 50% over its life.
Control Software – The software will operate on a Windows platform and allow you to compose various zones on the screen. A zone can play video, show text, images, time, etc. The control computer will allow importing of live video via video camera, DVD player, and TV receiver. The following formats are standard: VGA, DVI, RGBHV, PbPr (HDTV), Composite, S-Video and TV.
Screen Construction – Big screens are made up of modules. A typical module can be 1 x 1m, The module would have for example a resolution of 96 x 96 pixels. In this case the pitch is 10mm. So to achieve a 4 x 3m big screen you would need 12 modules. The total resolution in this example would be 384 x 288 pixels.
For portable screens – the modules would be made with snap on type connections to allow for easy set-up and breakdown at events. The modules would be made of steel with an ingress protection level of IP65 (complete protection from the weather) at the front and slightly less at the rear access for maintenance. Quite running fans are incorporated for cooling and ventilation.
Communication – between control computer and screen is via unshielded twisted pair net cable allowing maximum transmission distance of 130m. Using multi-mode fibre optics transmission distance can be increased to 500m.
Maintenance – There will be rear access comprises doors on each module. Replaceable service parts are the internal CPU, LED boards and switching power supplies. Unless safe access exists at the location, to comply with Health and Safety requirements the mounting structure will need to include walkways for service personnel.
In 1997, the first LED video screen was installed in a European stadium (Reebok Stadium of Bolton Wanderers Football Club). It was a multinational effort between MT Hungary, an Italian LED board manufacturer and Jayex. At the time the 7 x 5 square metre screen was installed at around £280,000 when the Jumbotron was around £1m. That revolution has continued with the LED video screen market having expanded and matured. Nowadays, the majority of LED boards are made in China helping to reduce prices dramatically. US and European suppliers add value with their control software and project management.
The buyer should particularly investigate the financial standing, project management skills and experience of the supplier. The customer would no doubt want to satisfy himself that spares and support would be available several years down the line. After having selected the supplier, he will need the supplier to survey the site and design the supporting structure. The customer has to make provision for power supply and arrange laying of data cable from location of control room to the screen. After installation the supplier would train the customer’s operating staff in the control software and simple maintenance.
About the Author
The author, Agam Jain has many years of experience in LED displays gained in his capacity as Managing Director of Jayex Technology Limited.
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