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11-17-2014, 04:55 PM | #1 |
I joined the Band! Join Date: May 2006 Location: Between a rock and a hard spot!
Posts: 1,786
| LED Light wire harness question
Based on these specs can anyone tell me what resistor is needed to run 4 bulbs on 3s or 12 volts? SPECIFICATIONS: Source Material:InGaN ! Emitting Colour:10MM POWER WHITE 1W LED LENS Type:Water clear Color Temperature: -- Luminous Intensity-MCD: Typ: 390,000 mcd Reverse Voltage:5.0 V DC Forward Voltage: Typical: DC Forward Current:300mA Viewing Angle:40 degree Lead Soldering Temp:260°C for 5 seconds Last edited by twissted; 11-17-2014 at 04:57 PM. |
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11-17-2014, 05:36 PM | #2 | |
Quarry Creeper Join Date: Oct 2014 Location: East
Posts: 232
| Re: LED Light wire harness question Quote:
3S = 12.6V 12.6v - 3vLED = 9.6V across the resistor / per bulb 9.6V / 300mA = 32ohms To size it, I2*R 300mA * 300mA * 32ohms = 2.88watts. Your better to run 2 bulbs in series on a string. Less wasted energy Then you need 22ohms @ 2 watts. Either way, you need a 4watt resistor per string so they don't melt everything around them. | |
11-17-2014, 06:01 PM | #3 |
I joined the Band! Join Date: May 2006 Location: Between a rock and a hard spot!
Posts: 1,786
| Re: LED Light wire harness question
I will use 2 resistors then? Using the 2 bulbs in series? Thank you. Or a resistor per bulb? Last edited by twissted; 11-17-2014 at 06:12 PM. |
11-17-2014, 06:28 PM | #4 |
I joined the Band! Join Date: May 2006 Location: Between a rock and a hard spot!
Posts: 1,786
| Re: LED Light wire harness question
I just ordered 20 of the 22 ohm 2w resistors 1.98 free shipping ebay is awesome!
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11-17-2014, 07:03 PM | #5 |
Quarry Creeper Join Date: Oct 2014 Location: East
Posts: 232
| Re: LED Light wire harness question
While your at it grab a couple 22ohm 4watts too. Your dissapation is 2watts so they may get pretty warm at rating
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11-17-2014, 09:14 PM | #6 |
I joined the Band! Join Date: May 2006 Location: Between a rock and a hard spot!
Posts: 1,786
| Re: LED Light wire harness question
FEATURES: New ! In excellent condition Long lasting (over 100000hours) Low Power Consumption I.C. Compatible Intensely Bright SPECIFICATIONS: Source Material:InGaN ! Emitting Colour:10MM POWER WHITE 1W LED LENS Type:Water clear Color Temperature: -- Luminous Intensity-MCD: Typ: 390,000 mcd Reverse Voltage:5.0 V DC Forward Voltage: Typical: DC Forward Current:300mA Viewing Angle:40 degree Lead Soldering Temp:260°C for 5 seconds Absolute Maximum Rating (Ta = 250C) PARAMETER MAXIMUM RATING UNITS DC Forward Current 300 mA Peak Pulse Forward Current (1) 450 mA Avg. Forward Current (Pulse Operation) 300 mA Operating Temperature -40 to +100 0C Storage Temperature -40 to +120 0C Lead Soldering Temperature 2600C for 6 seconds (1.0mm or 0.63 inch from Body) (1) Pulse conditions of 1/10 duty and 0.1msec width Electro-optical Characteristics (Ta = 250C) PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT Forward Voltage VF IF = 300mA 3.0 3.4 3.6 V Reverse Voltage VR IR = 300mA - 5 - V Dominant Wavelength lD IF = 300mA - X=0.31 Y=0.32 - - Viewing Angle 2q1/2 IF = 300mA 40 Deg. Luminous Intensity IV IF = 300mA - 390,000 - mcd |
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