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®

Model No.PS-2177

 Introduction

2

About the Sensor

The PS-2177 Light Level Sensor uses a silicon photodiode that produces a voltage 
that is proportional to light intensity. The photodiode has a spectral response range 
from 320 to 730 nanometers (nm) and a peak sensitivity at 560 nm, which is very 
close to the peak sensitivity wavelength of the human eye. The maximum dark cur-
rent is 10 picoamperes at one volt. The accuracy is ±10%.

Light Level Ranges

The sensor has three ranges which can be selected using the range select buttons on 
the sensor. The range for each button is represented by an icon.

Illuminance: Typical Readings

The following table shows typical readings for a variety of conditions

Usage

The sensor can be used for a variety of experiments.

Plant growth versus light intensity.

Light intensity through polarized filters.

Amounts of solar energy in various locations.

Relationship of light intensity versus distance for a point source.

Icon

Light Level

Resolution

Candle

0 to 1,500 lux

0.5 lux

Light bulb

0 to 15,000 lux

5 lux

Sun

0 to 150,000 lux

50 lux

Condition

Illuminance (lx)

Condition 

Illuminance (lx)

Sunlight

100,000

Quarter moon

0.01

Full daylight

10,000

Starlight

0.001

Overcast day

1,000

Warehouse

150

Very dark day

100

Offices, labs

500

Twilight

10

Supermarkets

750

Deep twilight

1

Operating rooms

1,000

Full moon

0.1

Detailed drawing work

1,500 to 2,000

PS-2500 PASPORT 

Extension Cable

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