Led Bright White

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..
What Is On YouTube Today?
K8044 with Ultra Bright WHITE LED
Here Are Some Items From Amazon You Might Like.
![]() Flexible Light Strip 300 SMD White LED Ribbon 5 Meter or 16 Feet By Ledwholesalers, 2026wh Sale Price: $13.00 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() HitLights LED Flexible Lighting Strip Cool White or Bright White, 5 Meter or 16 Ft, 3528 Type, 300 SMD, 24 Watt List Price: Sale Price: $8.99 You save: $31.00 (78%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() LEDwholesalers 16 Feet or 5 Meter Reel Bright White 5500k Flexible LED Ribbon with 300 3528 SMD Leds White Backing on PCB and Waterproof Gel and 3m Tape, 2089wh Sale Price: $19.00 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() Submersible Battery LED 10 Lights~WHITE~wedding~tea Light Sale Price: $8.39 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() LEDwholesalers 16.4 Feet 300 SMD LED Flexible Strip with Waterproof Sleeve,12 Volt Clear White LED Ribbon 5 Meter Reel, 2047WH Sale Price: $11.65 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() Micro LED 20 Cold White Color Lights Battery Operated on 7ft Long Silver Color Ultra Thin String Wire Sale Price: $5.95 Eligible for free shipping!Availability: Usually ships in 24 hours |
![]() 5 Meter Reel Warm White 3100k Flexible LED Ribbon 300 Leds 16 Ft by LEDwholesalers, 2026ww-31k Sale Price: $13.50 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() 100 led 10m Christmas Wedding Warm White Color String Lights,2021WW List Price: Sale Price: $5.95 You save: $14.04 (70%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() Waterproof 150 Color Changing SMD5050 LED Lighting Strip Kit RGB 16.4ft, 2038kit Sale Price: $37.00 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
![]() Fulcrum 30010-301 LED Battery-Operated Stick-On Tap Light, 3 Pack List Price: Sale Price: $5.99 You save: $3.21 (35%) Eligible for free shipping!Availability: Usually ships in 3-4 business days |
Items recently purchased on this site:
Thanks for visiting!





















































Eligible for free shipping!







