LT45-EU-EN v1.4 9/13
2
Introduction
CongratulationsonyourpurchaseoftheExtechLT45LEDLightMeterthatmeasureslightfromLED
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, blue, and purple
LEDsupto400,000Lux(40,000Fc).
TheLT45canalsocalculateluminousintensity(CD)usingadistance‐to‐the‐lightvalueprogrammed
bytheuserinmetersorfeetunits.
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
calibrationadjustment,AutoPoweroff(withdisablefunction),andautorangingfeatures.
This instrument isshipped fully tested and calibrated and, with proper
use, will provide years of
reliableservice.PleasevisitourwebsitetocheckforthelatestversionofthisUserGuide,Product
Updates,andCustomerSupport.
Features
OverloadIndication:LCDscreenwillshow“OL”attheupperleft‐handcorner
Batterystrengthstatusindication
DisplayUpdateRate:2.5timespersecond
SpectralresponsenearCIEluminousspectralefficiencyratings
CosineAnglecorrected
ConformstoJISC1609:1993andCNS5119generalclassASpecifications
Measurestheintensityofilluminationofwhite,red,yellow,green,blue,andpurpleLED
lightandallvisiblelightinLuxorfoot‐candles
CalculatesLuminousIntensity(CD)
Dataholdfreezesdisplayedreading
Maximum/Average/MinimumMemoryHold
Zeroadjustment
Autopoweroffwithdisablefunction
Automaticrangeadjustoptimizesaccuracyandresolution
Manuallystore/re
callupto99readings
Completewithlightsensor,protectivesensorcover,andcoiledcableexpandableto59”
(1.5m),9Vbattery,andhardshellcase
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