Btmeter bt 881d digital illuminance light meter measure lights 0 01 400 000 lux 0 01 40 000 fc foot candles luxmeter with 270ยบ rotated sensor for plants led lights indoor outdoor light tester btmeter.
Low light lux meter.
There are many free options available note that some apps might have ads or in app purchases.
Lx is the si derived unit of illuminance measuring luminous flux per unit area.
It is analogous to the radiometric unit watt per square metre but with the power at each wavelength weighted.
We use the dr.
Ask an adult to help you search for a lux meter or light meter app on a smartphone or tablet.
A light meter is a great reliable way to measure light.
Pyle plmt21 handheld lux light meter photometer with 20000 lux range 40 measurement range up to 20 000 lux sampling rate.
2 times sec reading hold function 9v battery operated.
The adjustable range for quick easy readings has an accuracy max 4 and repeatability of 2.
A camera with a 1 lux rating claims to be able to produce an image by the light of one candle that is about three feet away from the subject.
We ll be walking through the steps on how to use this specific device but it s a simple process that should translate to all light.
Specifically 1 lux equals the amount of light that falls on a one square meter surface that is one meter away from a single candle.
1 lux 0929 foot candle.
In photometry this is used as a measure of the intensity as perceived by the human eye of light that hits or passes through a surface.
It also helps you space out your plants and try different configurations with your light to maximize the amount of plant matter in the sweet spot.
Par meters are a bit more expensive but they accurately measure light in the 400 700 nanometer range and are designed to measure plant light.
It is equal to one lumen per square metre.
10 lux equals the amount of light produced by 10 candles one meter away.
How to measure light intensity using a light meter.
Low light level detection and measurement requires the use of a pmt sensor and highly sensitive light meter capable of measuring very low current or voltage levels.
Ilt combines a hamamatsu pmt miniature power supply filters and optics into a compact housing that allows measurements as low as nlux and fw cm 2 over the ranges of 250 780 nm.
Using a lux meter for natural sunlight gives a good indication of light for your plants but don t use it to measure fluorescent or artificial light intensity with it.
Meter light meter which has proven to be a reliable tool for the price.
