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LDR Sensor

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PROD Model:φ4
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 powerEnvironmental Temp.
Spectrumpeak valueLight resistance(10Lux)(KΩ)Dark resistance(MΩ)Response time(ms)
Φ4 seriesGL451615050-30~+70℃
5405- 100.63030
GL452615050-30~+70℃54010- 2013030
GL4537-115050-30~+70℃54020- 3023030
GL4537-215050-30~+70℃54030- 5033030
GL4548-115050-30~+70℃54050- 10053030
GL4548-215050-30~+70℃540100- 200103030




Camera shutter control

LDRs can be used to control the shutter speed on a camera. The LDR would be used to measure the light intensity which then adjusts the camera shutter speed to the appropriate level.


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

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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.