2 LT45-en-US_V2.1 6/20
Introduction
Congratulations on your purchase of the Extech LT45 LED Light Meter that measures light from LED
lamps in addition to fluorescent, metal halide, high-pressure sodium and incandescent sources. The
LT45 is capable of measuring the illumination of white, red, yellow, green, and blue LEDs up to
400,000 Lux (40,000 Fc).
The LT45 can also calculate luminous intensity (CD) using a distance-to-the-light value programmed
by the user in meters or feet units.
The LT45 can store up to 99 readings for later recall and includes Overload indication, Battery status
icon, Data hold, Maximum/Average/Minimum (MAX/MIN) tracking, push-button Zero calibration
adjustment, Auto Power off (with disable function), and auto ranging features.
This instrument is shipped fully tested and calibrated and, with proper use, will provide years of
reliable service. Please visit our website to check for the latest version of this
User Guide, Product Updates, and Customer Support.
Features
Overload Indication: LCD screen
at the upper left-hand corner
Battery strength status indication
Display Update Rate: 2.5 times per second
Spectral response near CIE luminous spectral efficiency ratings
Cosine Angle corrected
Conforms to JIS C 1609:1993 and CNS 5119 general class A Specifications
Measures the intensity of illumination of white, red, yellow, green, and blue LED light and
visible light in Lux or foot-candles
Calculates Luminous Intensity (CD)
Data hold freezes displayed reading
Maximum/Average/Minimum Memory Hold
Zero adjustment
Auto power off with disable function
Automatic range adjust optimizes accuracy and resolution
Manually store/recall up to 99 readings
Complete with light sensor, protective sensor cover,
(1.5m), 9V battery, and hard shell case
www.
.com
1.800.561.8187
