Proster Digital Luxmeters Illuminance Light Meter - Luminometers Lux Light Meter Photometers High Accuracy 4% Lux Meter with LCD Display Range 0.1-200000 Lux/0.01-20000 Fc

I received the instrument, in Mexico, ahead of its projected arrival (rather than later) and it 'read' light intensity (lux) off white objects (a little less than ambient) and black (much lower than ambient BUT not ZERO) . . . very easily, even for a dummy. I wanted it to show that light is not ¨reflected¨ off objects but is expressed as a result of light energy exciting an electron in a 'chromophore' attachment of molecules in objects, that then releases energy (as a colour) and I hoped to get a higher reading off 'white' than ambient. Well, I didn't but the black wasn't zero. I think black's a mixture of dark red and blue, the way that pigments produce it. However, I didn't have any problem with the light meter (only my dumb idea). It worked perfectly.

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I recently purchased this lux meter and I have to say, I am thoroughly impressed. This product exceeded all of my expectations. The quality of the product is outstanding! What I appreciate most about this product is how user-friendly it is. It is incredibly easy to use and has a convenient lux to foot candle conversion. I highly recommend this product to anyone looking for a reliable and efficient solution. It is worth the price.If anyone is confused, 1 lux is equal to 1 lumen per square meter and 1 foot-candle is equal to 1 lumen per square foot. So if the device reads 100 lux, then there are 100 lumens per square meter in that particular area. Same with foot candles except instead of a square meter it's a square foot.If you're wondering I used this product for a chemistry experiment.As a cherry on top, this product came with a battery.

i just use 1 time so I don't know it correct or not

If you need a basic light meter without extras like usb or temperature, this one is perfect. Simple, easy to use and accurate.

Lux readings inconsistent and are all over the place and woefully inaccurate. I have some professional meters and bought this cheap one to knock around with. Figured for about $10 I could compare it with a pro one and deal with it. Tried it out under controlled conditions and concluded the unit is absolutely useless. Into the circular file with it. The thing was so bad, I won't buy another that remotely even looks like it.Addendum ... got curious & disassembled it. Found a small square glass lens out of place. Placed it it front of the sensor photocell where it belongs. Unit now functions normally, HOWEVER it reads about 20% high(500 lux becomes 600 lux, 1200 lux becomes 1440, etc.). Keeping that in mind, at least it become a bit useable

To measure light inside and outside my house

I got this because the descriptions on LED bulbs seemed misleading and I wanted to test them myself. It works but not perfectly. It is a whole lot better than guessing. Let's talk about the device limitations. Ideally I would like to read lumens to do an apples to apples comparison. Lumens requires a device that surrounds the luminaire and reads all light emitted. Those are very expensive. So I live with Lux, the light put out at a specific distance on the sensor diameter. This does that. I found the meter to be directional. I think it sees more light that is in front of it than directly overhead. To get readings I took a box and lined it with Aluminum foil. I set the meter to max and put the box at the low point of the light and moved the box around. Then I recorded max reading. Here is the problem, and it is not the meters fault, you want to compare LED, Florescent, and Incandescent lights. You can't. Incandescent lights put out half their energy in heat. The sensor sees Infra Red as well. I have a row of 4000K LED Spot lights right next to a row of Incandescent spot lights. No one would walk in that room and say the Incandescent are brighter. Clearly the LED's are, but the lux reading is twice as high for the Incandescents. Even going to a 3000K bulb doesn't change it, LED's are cooler. The meter did let me compare bulbs of the same type. And yes they lie about watts consumed and the amount of output. I will say it is really nice having a cheap meter that gives me a quantitative value. Would I recommend this heck yes. Would I buy it again, try and get me to lend mine to you. Do I still love LED bulbs, yes. I am changing them out every time I can. Each new generation is better. The problem is if you are going to recoup you investment you have to sell product. Right now the product you sell today will be obsolete in 6 months. So they are all lying to get market share. Vicious circle, but data helps me.

Bom

used to measure light from my fishtank lights

Em menos de 2 meses de que recebi esse produto ele simplesmente não funcionou mais. E vendedor não me responde.

Unit seems to do everything it is supposed to. Good for checking light levels near plants. There are no useful instructions on what any of the readings mean. Research is a must to understand this unit.

As described