• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

  • 1000+ Circuits
  • Privacy Policy
  • About Us
  • Contact
  • Disclaimer
  • Videos – Circuit Test Results
You are here: Home / Meters and Testers / LED Brightness and Efficiency Tester Circuit

LED Brightness and Efficiency Tester Circuit

Last Updated on March 13, 2019 by Swagatam 4 Comments

The post details a simple LDR brightness and efficiency tester circuit set up using an LDR and a digital Ohm meter. The idea was requested by Mr. Prashant

Technical Specifications

I want to check brightness and light of 1 watt led.
Can i check it with help of ldr. Bekoz luminous sensor cost is too high.
How can i measure which led has  bright light if i have three quality type 1 watt led.
Plz solve the prob.
Thank you
Prashant sharma

The Design

LEDs are not very complex light emitting devices when operated with DC supplies and the illumination level becomes directly proportional to the current across the LED.

Therefore reading the brightness level under the above condition may not require sophisticated circuitry as we have in lux meters, instead the reading can be simply obtained using an LDR and a cheap ohm meter.

The set up design of an LED brightness indicator may be witnessed below:

We see an LDR enclosed inside a hollow opaque tube. The LED whose brightness is required to be measured is inserted through the opposite hollow end of the tube such that both the devices are brought face to face inside the tube.

A translucent white material such a roughened acrylic piece could be introduced between the two device inside the pipe in order to make the LED light diffuse over the LDR and produce an uniform distribution of light instead of getting focused over a small inconsistent area of the LDR.

With a DC applied across the enclosed LED leads the shown set up would produce a direct reading in the ohm meter indicating the Ohms of the lowered LDR resistance. This value may be noted and compared by other LEDs or a standard good quality LED in hand for getting the required information regarding their brightness levels and efficiency.

Circuit Diagram




Previous: How to Measure Dissolved Oxygen in Liquids
Next: Automatic LED Candle Light Circuit

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

You'll also like:

  • 1.  Making an Accurate Speedometer Circuit
  • 2.  Simple Transformer Winding Tester Circuit
  • 3.  2 Simple Capacitance Meter Circuits Explained – Using IC 555 and IC 74121
  • 4.  How to Measure AC Milli-volts Using IC 741
  • 5.  Stud Finder Circuit – Find Hidden Metals Inside Walls
  • 6.  Simple ESR Meter Circuit

Please Subscribe (Only if you are Genuinely Interested in our Newsletters)


 

Reader Interactions

Comments

    Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic! Cancel reply

    Your email address will not be published. Required fields are marked *

  1. Search Related Posts for Commenting

  2. basit momin says

    value of LDR for checking led brigntness ….and sir can we get the led wattage by calculating the number displayed in ohm meter is their any formula for that

    Reply
    • Swagatam says

      you can use any standard LDR and calibrate the meter reading by illuminating the LDR with an LED whose values are known, and then by referring to this reading on the meter you can calibrate the full sale of the meter proportionately.

      Reply
  3. basit momin says

    Hello sir ………what should be the value of LDR

    Reply
    • Swagatam says

      Hello Basit, value of LDR for which circuit?

      Reply


  4. COMMENT BOX IS MOVED AT THE TOP


Primary Sidebar

Electronic Projects Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (51)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (92)
  • 741 IC Circuits (18)
  • Amplifiers (49)
  • Arduino Engineering Projects (82)
  • Audio Projects (83)
  • Battery Chargers (75)
  • Car and Motorcycle (87)
  • Datasheets (44)
  • Decorative Lighting (Diwali, Christmas) (31)
  • DIY LED Projects (81)
  • Electronic Components (96)
  • Electronic Devices and Circuit Theory (34)
  • Electronics Tutorial (99)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Games (2)
  • GSM Projects (9)
  • Health Related (17)
  • Heater Controllers (23)
  • Home Electrical Circuits (98)
  • Incubator Related (6)
  • Industrial Electronics (25)
  • Infrared (IR) (39)
  • Inverter Circuits (94)
  • Laser Projects (10)
  • LM317/LM338 (21)
  • LM3915 IC (24)
  • Meters and Testers (52)
  • Mini Projects (152)
  • Motor Controller (64)
  • MPPT (7)
  • Oscillator Circuits (12)
  • PIR (Passive Infrared) (8)
  • Power Electronics (32)
  • Power Supply Circuits (65)
  • Radio Circuits (9)
  • Remote Control (46)
  • Security and Alarm (55)
  • Sensors and Detectors (115)
  • SG3525 IC (4)
  • Simple Circuits (72)
  • SMPS (30)
  • Solar Controllers (60)
  • Timer and Delay Relay (51)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (37)
  • Ultrasonic Projects (12)
  • Water Level Controller (45)

Follow Homemade Circuits

Facebook
Twitter
YouTube
Instagram
My Facebook-Page
Quora

Feeds

Post RSS
Comment RSS

Circuit Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2021 · Swagatam Innovations

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok