Led Bright White

Posted in Lamps, Shades & Ceiling Fans by admin on March 5, 2010

In today's economy it's crucually vital to get the most you can for your purchasing dollar. So there's no sane reason to over pay for Led Bright White when there are a wide assortment of them for sale on eBay. Plus, eBay is one of the biggest and most reliable online shopping sites in the entire world. This site is sanctioned by eBay to help you find the Led Bright White you are shopping for and show them to you. If you don't see the Led Bright White you are shopping for below. Use the search feature on the right to find the style you want.

NEW USB Flexible 28 LED 3 Modes Clip-on Light Lamp Bulb for Home, BBQ,Camping
US $.95

110V - 240V AC 3W (3x1W) Warm Soft White LED 3 Watt E27 Base Light Bulb
US $3.99

New Maxxima MLS-03 Motion Sensor 3 LED Light
US $15.95

110V - 240V AC 3W (3x1W) Warm Soft White LED 3 Watt Light Bulb GU10 Base
US $3.99

110V 220V PURE WHITE 104 Led 12W Wide Angle High Power 3500K Down Light Bulb E27
US $5.00

High Quality Aluminium Alloy 7W LED 710~770lumens E27 85~265V 50~60HZ Pure white
US $.99

110V - 240V AC 3W (3x1W) Cool Pure White LED 3 Watt Light Bulb GU10 Base
US $3.99

220V E27 60-LED 3W Bright White Light Cup Bulb Lamp for office dance ball
US $.01

Waterproof 5m LED 3528 SMD 600 White Flexible DC 12V Strip Lamp Light Car IP65
US $.99

12W DC 12V-24V 201 LED E27 Corn light Bulb Energy Saving LAMP Pure White
US $29.99

12W DC 12V-24V 201 LED E27 Corn Screw light Bulb Lamp Warm White Energy Saver
US $31.40

Dimmable 15W LED Ceiling Recessed light DownLight Warm White lamp Hole 140mm
US $45.53

9W 9x1 Dimmable LED Ceiling Down Light Warm White Lamp with Driver Decoration
US $31.96

Dimmable 5W LED Ceiling light Recessed lamp DownLight Warm White 110V/240V Bulb
US $18.66

Dimmable 7W LED Ceiling Recessed light DownLight Warm White lamp bulb +Driver
US $21.42

12W 960LM Dimmable LED Ceiling Recessed Down Warm White Light Lamp with Driver
US $34.77

Dimmable 9W LED Ceiling Recessed light DownLight Warm White 3000K spot lamp bulb
US $33.63

Dimmable 18W 18 LED Ceiling Down Light Warm White Room Lamp Bulb Driver NEW
US $48.21

Dimmable 3W LEDs Ceiling light Recessed lamp DownLight Pure White Fixture bulb
US $11.87

Dimmable 7W LED Ceiling Recessed light DownLight Pure White lamp bulb w Driver
US $20.35

Dimmable 9W 9x1 LED Ceiling Recessed light DownLight Pure White spotlight lamp
US $33.63

2 x DAYLIGHT WHITE 28 5050 SMD 9W=80 Led 90 Day War Wide Angle PAR20 Light Bulb
US $7.80

New Remote Control LED Bulb Light GU10 85V~240V 3W 16 Color Changing Fast Ship
US $7.85

New 10 pcs high bright 1W power white led 100LM 1 watt
US $14.99

3W LED White Light Lamp Bulb Spotlight 38 Beads Bright MR16/12V
US $.97

High Quality Aluminium Alloy 7W LED 710~770lumens E27 85~265V 50~60HZ Warm White
US $.99

High quality 3W GU10 RGB LED Bulb Lamp lights 16 Color changing with IR Remote
US $7.98

GU10 12 SMD LED Light Bulb Lamp Spotlight 110V-240V Hot
US $.99

3W E27 socket RGB LED Bulb Lamp spot light 16 Color changing + 24Key IR Remote
US $7.98

Energy saving 3W GU10/E27 RGB LED Bulb Lamp light 16 Color changing + IR Remote
US $7.98

3W 7W 9W 12W 15W 18W Ceiling light Recessed lamp Bulb Downlight Dimmable/Not Dim
US $12.99

G4 1 LED Bulb Lamp Soptlight 0.2W Pure white Decoration LAMP 12V
US $1.54

1 LED G4 Spotlight Lamp Bulb Decoration Light 0.2Watt 12V Pure White
US $1.55

6X 3W CREE XP-E LED Spotlight GU10 MR16 E27 Light Warm Cool White 3W=60W Halogen
US $49.50

1M Bright White 60LED/M Non-Waterproof 335 SMD Side View LED Strip for Carbinet
US $11.69

Wholesale free shipping 50XGU10 SMD5050 led lamps 220-240V4.5W
US $223.25

AC 220V 630LM 7X1W Cool White 7 LED Track Rail Spotlight Lamp 6000K-6500K
US $24.73

110V 220V WARM WHITE 104 Led 12W Wide Angle High Power 3500K Down Light Bulb E27
US $5.00

GU10 48 SMD 1210 LED Light Lamp Bulb White 9W 220V
US $3.58

GU10 3 LED 3W Bulb Gold 85-265V White Energy Saving Focus Spot Light Lamp
US $.09

New Hot corn light bule Warm White 6000~6500K 220V E27 7W 108 LED
US $.09

Hot sale SMD Corn Light Bulb Lamp White AC 220V E27 12W 900Lm 60 Led 5050
US $.09

New Hot corn light bulb White 6000~6500K 220V E27 7W 108 LED
US $.09

Hot sale SMD Corn Light Bulb Lamp Warm White AC 220V E27 12W 900Lm 60 Led 5050
US $.09

2 x 110V 220V WARM WHITE 28 5050 SMD 9W 80 led 90 Day Warr Down Light Bulb E27
US $7.80

110V 220V DAYLIGHT WHITE 104 Leds 12W Wide Angle 500 lumen PAR30 Light Bulb E27
US $5.00

12V 5050 SMD 300 LED RGB 5M Flexible RGB LED Strip Light + 24 Key Remote Control
US $29.99

48W 12V 3528 SMD 600 LED 5M Waterproof Warm White LED Flex LED Strip Light
US $19.99

GU10 3 LED 3W Bulb Gold 85-265V Warm White Energy Saving Focus Spot Light Lamp
US $8.25

3W LED White Light Lamp Bulb Spotlight 38 Beads Bright E27/110V
US $.99

3W 5W 7W 9W 12W 15W 18W LED Ceiling light Recessed lamp Downlight Dimmable/Not
US $9.49

How to make superbright White LED as bright as possible?

I'm using power supply of 240V AC, going thru a step down transformer to 12V AC, thru a brigde rectifier and across a capacitor. I connect 4 LEDs in series together with a 1K ohm resistor. How to make these LEDs as bright as possible?

If you have a data sheet for your LEDs it would be helpful, while the 20ma value others have given is a reasonable value, if you are looking for maximum brightness you may want to know what your specific LED are rated for, if they are "super bright" the current rating might be higher. You will also need to know the forward voltage at the current you want to use.
Perhaps a typical forward voltage for a white LED might be 3.4V, with 4 in series you have 13.6V, which is more than 12, that might be why some said parallel would be better, but actually you probably have more than 12V, a very lightly loaded bridge rectifier circuit will be charging the filter capacitor to near the peak voltage, not the RMS, 12 * sqrt(2) ≈ 17V subtracting 1.4V for the drop in the bridge, and rounding down since you won't quite get to the peak, lets call the available voltage about 15V
15 - 13.6 = 1.4V; 1.4V / 20ma = 70Ω
Now 1.4V is a pretty small difference, and if your particular LEDs have a little higher voltage, or your transformer or capacitor is small you might not get maximum brightness. So you might put two series pairs in parallel, but each series pair will need it's own series resistor, putting a number of paralleled LEDs in series with one resistor does not work well, since there is some slight variation in LEDs the current will not be equal in all of them (while if they are in series the current has to be same, by definition)
But if you can use a series circuit it will be the most efficient, in the example above, 1.4V * 20mA = 28mW lost, if you used all 4 LEDs in parallel, with a 15 - 3.4 = 11.6V drop needed (580Ω) 11.6 * 4 * 20mA = 928mW loss, not a lot of powers, but still..

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