Extech LT40 LED Light Meter
Electronics > Camera & Photo > Lighting & Studio > Light Meters & Accessories > Light Meters
About this item
- USB interface for easy setup and data download
- Selectable data sampling rates from 1 second to 24 hours
- LCD displays current readings, min/max and alarm status
- Includes Windows 2000, XP and Vista compatible analysis software
Reviews
★★★★★
Style: White LED Light Meter | Verified Purchase
Curmudgeon Neighbor Complained About Christmas Lights - This Shut Him Up
Received an unpleasant email from a grouchy neighbor complaining about our outdoor Christmas lights. He suggested that we might be in violation of the local light ordinance and droned on about how our lighting was ruining his ability to stargaze and night - in Seattle, in the middle of a gloomy, socked in winter. Uh-huh. Before telling the geezer to stuff it, wanted to make sure we were not in violation of said lighting ordnance, so I ordered this meter to have a look for myself. Easy to use right out of the box (batteries included), and I was pleased to learn that we were in full compliance with local ordinance. Worth every penny.
★★★★★
Style: White LED Light Meter | Verified Purchase
Great meter. Get the one with separated sensor
Great meter. Seems super accurate, and quality. The cap that covers the light sensor always reads 0 and calibrates every time you turn it on. I use it for testing light intensity from my grow lights in a grow tent. I found it would have been much easier to read the lcd screen if the sensor was separated from the main module/screen. My grow plants are very close to the grow light so I end up barely being able to view the screen and the light is blinding that close so it’s hard to even read the screen if I can view it. A separated sensor just gives you more options for reading, but I understand it would be less portable.
★★★★★
Style: White LED Light Meter | Verified Purchase
I would buy it again.
The Extech LT40 LED Light Meter is easy to use and appears to provide reasonable measurements. I say reasonable as i have no good method to determine the true accuracy of the meter, and the readings i get appear within a window of what i would expect for common light sources. I typically use it for readings of 10 foot-candles and below, usually in the 0.3 to 3.0 range, and with LED lighting, induction lighting, and metal halide lights.
I performed a couple of measurements in an office environment and compared the readings to a lighting print of the area, and my readings were in the general area of what one would expect for the office area, and compared favorably with architectural lighting prints.
The only drawback so far for me is the display is not backlit, so using it in the darker environment I am typically in can present a challenge at times, however, worst case I use the Hold feature and then read the display. Also, since the detector is fixed to the meter and not even rotatable, at times taking readings requires using the Hold feature if the meter needs to be facing away from me.
For the money and the ease of use, I would buy this again.
★★★★★
Style: White LED Light Meter | Verified Purchase
Small and lightweight
I use these for restaurant inspections as a health inspector. It is small enough and light so I don't mind carrying it in my tool bag everyday. It's a luxury item, because most inspectors could care less about proper light levels when there are so many facilities with bad food temps. I mainly use it on new construction, when they have the ability to make adjustments more easily. Works well. Just pop off the protective black cover to reveal the white frosted dome and start reading.
★★★★★
Style: White LED Light Meter | Verified Purchase
works well when picking out lighting
Needed this meter to determine the type of lights we needed / brightness in a new office we are building.
Works great. Has not broken yet, so, its a good buy in my opinion.
★★★★★
Style: White LED Light Meter | Verified Purchase
Quality meter without the wires
For the price, works great.
Purchased this for use in acquiring night light meter readings on roadways. It allows for lux or foot candle measurements. The instruction manual covers the quirky min/max average function. Otherwise, it did a great job on the jobsite. The included bag provides for good storage and the device is sturdy and works good in a commercial environment.
The only issue is there is no back light, which made night readings a little difficult. The fact that the light meter was integrated into the device meant there was no additional wires to manage.
★★★★★
Style: White LED Light Meter | Verified Purchase
Really like this meter
I really like this meter. It is very easy to use. Several engineers at work have borrowed it. Highly recommend.
★★★★★
Style: White LED Light Meter | Verified Purchase
Good Value
Portable and easy to use! Use it for temporary lighting measurements. (Puts the general contractor in their place lol)
★★★★★
Style: White LED Light Meter | Verified Purchase
Excellent form factor, very user friendly
Very good device - excellent form factor for performing walk-around surveys, portable and with good battery life. Features are user friendly and do not require a manual to figure out. Self-calibrating feature is an excellent touch for longevity.
★★★★★
Style: Color LED Light Meter | Verified Purchase
Light meter needer
Easy to use and seems to be accurate.
Question & Answer
Question :
Does this item come with calibration certificate?
Answer :
Hello Antonio - there isn't a calibration certificate. Based on the various tests I've done the results make sense and the machine is highly responsive. This isn't what I would regard as a precision instrument, but for my purposes g it worked fine.
Question :
Does this perform well in very bright conditions ( very sunny conditions) and in now light conditions?
Answer :
I feel that the Extech LT40 LED does respond fairly well in very bright conditions. As I see it, the meter is designed to read environmental conditions, such as light coming into a building or space, or even on the exterior. If you need to read just the solar conditions (visible light) in an unobstructed open space or area there are better, but often higher priced, meters for that purpose. Nick M
Question :
can this be used for photography?
Answer :
No, not as far as I am aware. It is for measuring specific spectral bands of light.
Question :
Will this measure 3000k?
Answer :
no. does not measure color temperature
Question :
What is the minimum light level it will measure?
Answer :
According to the data sheet, the device can be calibrated to zero. Therefore it presumably will measure from zero to 40,000 fc with + or - 3%.
Question :
Does this measure the amount of lumens a light contains?
Answer :
It measures the lumens that reach the sensor. If you want the total lumen output of a single lamp or fixture, you need to isolate it from all other light sources.
Question :
Will this measure 3000k?
Answer :
The instrument measures up to 400,000 Lux.
Question :
Will the meter lt 45 measure warm white and neutral white ?
Answer :
This is a "Light Meter"... It measures quantities of photons that fall or being reflected on to a surface, it does not distinguish specific Kelvin Temperatures.
I uncertain as to what it is you are trying to say or measure.
Question :
It is stated that it will measure white led. what kelvin is that? 2700-6400?
Answer :
i do not know what degree kelvin white is.
Question :
which one is the better option?
Answer :
no
Comments
Post a Comment