1W Warm White Power LED Star

Stock code: 3547
filler

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Q:
Hi there,

I was looking to use this with a 18650 3.7V battery. Is this suitable? By my calculations, with a 3500mAh this LED should light for around 7-8 hrs, is that correct?

Would I also, therefore, be looking at a ~1ohm resister or would your 2.2ohm one work correctly without reducing brightness?
Asked by: Mike Bartlett
A:
Hi Mike, based on the LED star being 1W and using a 3.7V battery, you would have about 270mA of current being drawn. This coupled with the voltage of 3.7 would mean you need a 13Ohm resistor, however as the current draw is quite high you would need a resistor that could handle 270mA of current being drawn through this.
Answered by: Michael Lockhart
14-May-18

Q:
Hi, could I use a 20000mAh+ USB powerbank with 3x 2.4A USB outputs to run three of these LED's? With each LED wired into a 10Ohm resistor and a USB cable? Thanks
Asked by: Adam
A:
Hi Adam,

Thank you for your question I have had a look and I believe that setup should work.
Answered by: Cullen Lewis
20-Jun-17

Q:
Hi I used the calculator and got this:

Voltage Source (VS) 12 Volts (V)
Voltage drop from LED (VLED) 6.4Volts (V)
Current through the LED (ILED) 310
Resistance (R)18.06452
LED Power (P) 1.984Watts (W)

Which advises a 20 ohm resistor rather than a 10 ohm as you advised Phil Palmer - is this due to the potentiometer?

Thanks

Asked by: Jeremy
A:
Hi Phil, if you are wanting to work out what resistor is required it would just be Voltage over Current. The example where a 10 Ohm power resistor is used is only correct if you have three LED stars in series. If you are just using 1 you would need a 33 Ohm resistor.
Answered by: Michael Lockhart
31-May-17

Q:
hi, i was wondering if you could wire up a iphone charger to the circuit as i want to add it into the lap i have made thank you.
Asked by: Nathan Dundas
A:

Hi Nathan, It is very difficult to comment on if the IPhone charger would be suitable as we don’t have any information regarding this. For the 1W LED star we have three recommend power options that can be viewed here, https://www.kitronik.co.uk/blog/how-to-use-1w-star-led/. The key points to bear in mind when selecting your power supply is it must be able to deliver 310mA per 1W LED star and the correct power resistor must be used depending on the supply voltage and number of LED stars your using.

Answered by: Michael Lockhart
26-Apr-17

Q:
hello,

one of my pupils would like to use two of these 1 watt LEDs (code 3547) using your 12v power supply. (code 2265)
they would also like to dim the LEDs using a 10k pot (code 3010-10K)

which power resistor would you recommend to use ?


Asked by: phill palmer
A:

Hi Phill, With regards to using a potentiometer to dim an LED you would only be able to dim a small section of what the LED emits, as such you would likely have the LED on, it would then dim slightly and then go off as you turn the potentiometer. If you wished to try this circuit you would need to use the following potentiometer, 3005-50R, https://www.kitronik.co.uk/c3005-wirewound-potentiometer.html


You would connect this in series with the two power LED stars, and then put the 10 Ohm power resistor in parallel with the 2 LED stars and potentiometer.

Answered by: Michael Lockhart
26-Jan-17

Q:
Can this LED be used with a 3v penny battery? I know this is less than the forward voltage but I'm assuming that the LED just won't be as bright rather than not work at all. Thanks.
Asked by: Chris
A:

Unfortunately you wouldn’t be able to use a coin cell battery to power this, the LED star draws 310mA and the coin cell batteries can only supply 200mA.

Answered by: Michael Lockhart
06-May-16

Q:
You have indicated a 10k linear potentiometer can be used to dim the LED.
Is this wired in series to the resistor?
If not could you provide a circuit diagram to show how this can be done?
Thanks.
Asked by: Keith
A:

The following link explains how you would need to connect this up, also it explains a little more into how it works, https://www.kitronik.co.uk/blog/how-to-make-a-battery-operated-dimmer-light-project/

Answered by: Michael Lockhart
09-Feb-16

Q:
I'm a A Level product design student and we have an LED lamp project, I was wondering if i were to wire 3 of the 1 W LED's in parallel to an electromagnet if a 12 volt power supply would be strong enough to run all of this?
Asked by: Tyler Blackborough
A:

It would depend on the current of the supply, and also the current that the electromagnet uses. You might get some back EMF from the electromagnet, so it would be worth putting a beefy blocking diode in line with the LEDs

Answered by: Michael Lockhart
08-Feb-16

Q:
Hi I am a teacher of GCSE product design with the project of lighting and was hoping to secure two alternative methods of lighting: a mains/USB powered circuit such as the CREE LED Kit you supply and an equally bright star LED powered via a battery therefore a portable option. I was wondering as this is the LED featured in the USB kit could it be powered by a battery source and if so what would be best and would a resistor be necessary. Also would this be the best option for a bright battery powered light or do you recommend an alternative.
thanks
Sanj
Asked by: Sanj Singh
A:

Yes you can use a battery to power the LED, you can power it from either AA batteries or a Polymer Lithium Ion Battery. This would give you around 3 hours of battery life. It would still be recommended to use a resistor, and this would depend on the batteries you wanted to use.

Answered by: Michael Lockhart
26-Aug-15

Q:
Is it possible to light more than one of these LEDs from a single micro-USB breakout board?
Asked by: Douglas Grainger
A:
Yes, if you are using a mobile phone charger as the power source and it's rated to at least 1A you can light 2 of them safely if wired in parallel with a 10R 2.5W power resistor each.

If you are plugging the kit into a computer though you don't want to do this as it may damage your USB socket.
Answered by: Aaron Sturman
20-Oct-14

Q:
Hi there - I am looking to put together an A level project (AS) for next September (I am a DT teacher out in Abu Dhabi) . I want them to make a product aimed at Students, that contains both a light and an ipod / phone amplifier..with a nice speaker (effectively a dual functioning product). My initial thought was IKEA for a smallish light (12V) and then Rapid for their simple one speaker AMP circuit Kit so the students could copy the board and transplant the components ... However I wondered if you guys had anything that would fulfill all of my needs (as a one stop shop) and you could recommend stuff that would enable them to make a quality product that would suffice... ?? cheers SImon
Asked by: simon wood
A:
You could try a 1W or 3W LED star with appropriate power resistor. (check the resources page if you aren't sure) and a mono amp kit. (not the pre-built ones, they have SMT bits that cant be transplanted easily.) You could run all this from a 12V 1A power supply.
Answered by: Aaron Sturman
27-May-14

Q:
If using your 5V USB supply would it be possible to use a potentiometer with this LED as a dimmer ?
If so what value would you recommend as the resistor in the data sheet is quite small.
Thanks
Asked by: Phil Palmer
A:
Yes you can do this, you will want to use the potentiometer as well as the resistor mentioned in the data sheet. That way when the potentiometer is set to 0 ohms the LED will still be protected.
You should use a potentiometer with a suitable power rating. http://www.kitronik.co.uk/products/components/resistors/metal-shaft-linar-potentiometers/10k-16mm-linear-potentiometer/ this one is ok.

If you need a circuit diagram to help show how to wire it up let me know.
Answered by: Aaron Sturman
03-May-14

Q:
Would it be possible to power a number of these [say 6] with a 6+ volt 3.5watt cycle hub dynamo. Thankyou
Asked by: Kevin Tulliver
A:
The LEDs have a forward voltage of 3.2V per LED so if you put 2 LEDs in series then they will have an overall voltage of 6.4V. I don't know how much above 6V the dynamo will be under load, so you would want to test this. The two LEDs would take a total of 1W so if you repeated this three times then then you would need 3W and the dynamo you mention is 3.5W so yes if you connect 3 lots of 2 series LEDs together then it should be fine. I'd just make sure with a multimeter that the current going in to each LED is within the rated amount (1W, 3.2V = 300mA), if not then you should use a power current limit resistor.
Answered by: Geoff Hampson
03-Dec-12

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