The following article explains the main technical features and specifications of 3 watt white LEDs. Let's learn more regarding their operating parameters and safe-operating limitations.
Contents
Main Features
- Extreme luminosity capability
- Extreme working life > 50K hours.
- Very Low thermal resistance.
- SMD technology allows embedded PCB type sodering.
- Completely UV free design
- Enhanced ESD protections
Image Courtesy - https://www.led-display.cc/High-Power-LED/Q1B/LP5W-80-SERIES:-5-watt-high-power-LED.jpg
The soldering details and dimensions of a typical 3 watt LED may be checked in the following diagram:
The dimensions are in millimeters.
The anode side of the LED can be identified by the given hole on that particular side.
The PCB heatsink pad must be tightly in contact with the body metal or the slug of the device. Remember the body metal is neutral and has no connection with either the anode or the cathode of the device, and must not be linked with any of the leads of the LED.
The lens of the device is sensitive to rough cntacts so excercize caution not to brush any hard or shrp material with the lens which might considerably reduce the light intensity from the LED
Technical parameters of the device:
Luminous Flux - 100 to 120 lm
Forward Voltage - 3.3V to 4 V maximum. These are the minimum and the maximum limits for operating the LED.
Optimal viewing angle - 90 degrees.
Absolute Maximum Ratings
These are the values which indicate the extreme limits of the relevant parameters above which the device might get instantly damaged.
Forward Current - 1 ampere
Power Dissipation - 4 watts
Junction Temperature - 125 degrees Celsius
Operating temperature - minus 30 to 85 degrees Celsius
WARNING - THE EXPLAINED 3 WATT LED SHOULD BE OPERATED WITH THE ABOVE PARAMETERS ONLY AFTER MOUNTING IT OVER A SUITABLE HEATSINK FACILITATED PCB. THE DEVICE WILL NOT WITHSTAND THE OPERATIONS FOR MORE THAN 5 SECONDS WITHOUT A SUITABLE HEATSINK ATTACHED TO ITS BODY.
Courtesy - https://www.futurashop.it/pdf_eng/8220-L-HP3PW.pdf
Krishna says
1) I have 3 X 3W LEDs, how many LEDs can i conncect to USB charger power? which ohms risistor i need?
2) How many 3W LEDs can i connect to 9V HW battary (series / Parallar)? which ohms risistor i need?
Swagatam says
assuming the voltage rating of the LED is 3.3V, then
R =5 – 3.3/0.9 = 1.88 ohms or 2 ohms, and wattage is 2 watts
a PP3 HW 9V battery will not illuminate any high watt LED due to low current
basit momin says
Hello sir I have 12V 2amp smps adapter so i want to run 1watt leds on that so how many leds can I use on it
Swagatam says
hello basit, you can connect 8 LEDs in all, made by connecting two strings of 4 LEDs in parallel…a 1 ohm/1watt resistor must be included with each of the series…
Swagatam says
..sorry with 2amp current you can double that, that is connect 4+4+4+4 = 16 LEDs total…
Rohith N says
Hi sir, regarding 1 watt Led what would be approx cost , i dont know over my place its avail are there any online sites for purchasing? also as a beginner i want to know much about these.
i have heard that 1 w led should not be exposed to eyes , leaving blind this can cause permanant damage to eyes?
Swagatam says
Hi Rohith, buying online could be risky and time consuming, you should go to your nearest electronic retailer and ask him regarding it.
Yes 1 watt leds are particularly extremely bright which could cause temporary blindness, and headache if looked directly into them while illuminated.
Rohith N says
Thank you very much sir. one more question 1w led has 9mm base diameter? what would be the current & voltage rating? i got an led saying its 1w having 9mm , like an ordinary led but bigger without any need of HEAT SINK.
Swagatam says
voltage is normally 3.3V and current 300mA, even though it has a base an external heatsink is recommended .
Rashid Ansari says
All right , Thank you Sir.
Rashid Ansari says
Thank you Sir for your reply.
Can you tell me how long I have to keep ON this light to sterilize 10 litters of water?
Rashid
Swagatam says
I am not exactly sure about that, might depend on many factors like clarity of water, material of the bottle etc. you may keep it ON for at least 1/2 an hour to be perfectly sure.
Rashid Ansari says
Hello Sir,
I need to build an Ultra Violet LED water purification for my home and need a simple but efficient circuit for this. Can you please help me in this regard.
Thank you.
Rashid
Swagatam says
Hello Rashid,
You may use a camera flash circuit for implementing it, because UV LED are too costly.
the xenon tube can be placed just beside the glass water bottle so that the flashing light from the xenon tube passes through the water. This will effectively sterilize the water from the present microorganisms.