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LDR Sensor

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PROD Model:φ3
Maximum Applied Voltage: the maximum voltage that can be continuously applied to a component in the dark
Dark Resistance: resistance value at 10 seconds after 10Lux illumination is turned off
Maximum Power Consumption: maximum power consumption when the ambient temperature is 25 ° C
Bright Resistance: after 2 hours of exposure with 400-600Lux light, the test value under 10Lux light of standard light source (color temperature 2856K)
γ Value: logarithm of the ratio of the standard resistance value at 10Lux illuminance to 100Lux illuminance
γ= Lg(R10/R100) /Lg (100/10) =Lg(R10/R100)


A photoresistor is a resistance made of a semiconductor material whose conductivity changes with the change of illuminance. This feature is used to make photoresistors of different shapes and light-receiving areas. Photoresistors are widely used in toys, lamps, cameras and other industries.


Epoxy encapsulation

Good reliability

Small size

High sensitivity

Fast response

Good spectral characteristics


SpecificationTypeMaximum VoltageMaximum power



Spectrumpeak valueLight resistance(10Lux)(KΩ)Dark resistance(MΩ)Response time(ms)
φ 3seriesGL351610050-30~+70℃5405- 100.63030
GL352610050-30~+70℃54010- 2013030
GL3537-110050-30~+70℃54020- 3023030
GL3537-210050-30~+70℃54030- 5033030
GL3547-110050-30~+70℃54050- 10053030
GL3547-210050-30~+70℃540100- 200103030




They have a very simple structure and they are low cost and rugged devices.They are widely used in many different items of electronic equipment including photographic light meters, fire or smoke alarms as well as burglar alarms, and they also find uses as lighting controls for street lamps.


1. What is the size for LDR?

φ3 series, φ4 series, φ5 series, φ7 series, φ10 series, φ12 series, φ20 series.

2. What is your production capitable?

5 million Pieces per Month

3. Which of the photoresistor's will be the best to allow an led to only come on in complete darkness

It depends on the circuit you intend to use. 

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SENBA Sensing Technology Co.,Ltd.(stock code:300701), was founded in 2005, with the focus on producing the top quality photoelectric components, such as PIR sensors, Photoresistors,Light Sensors, Flame detectors etc. Our strategic goal is to master the core technology.