Digital light meter

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bella-headlight
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Digital light meter

I am looking for suggestions for a budget light meter please.
Would something like this be ok http://www.ebay.co.uk/itm/Handheld-LCD-Digital-Lux-Meter-Light-Tester-200000Lux-20000FC-PEAKMETER-MS6612-/261860422305?hash=item3cf818f2a1:g:yUsAAOSwZtJW-04w

Ian

Edited by: bella-headlight on 04/06/2016 - 20:40
1dash1
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I’d caution you about getting a single-unit light meter.

1. When using a single-unit light meter, such as the MS6612, you will need to take care of details such as how you can position it such that you physically look at the meter reading without obstructing/interfering with the light source. Often times, I find that the mere presence of my body or face next to the meter causes the readings to increase or to decrease. Sometimes this is due to shadowing. Sometimes this is due to reflectance. Always, it is a bother.

2. When taking readings under relatively low light conditions, it is hard to read the LCD display. You may need an auxiliary light to illuminate the display in order to read it. It is very difficult to isolate the auxiliary light from the light sensor.

I suggest that you get a light meter with a separate sensor, like one of these:
http://www.amazon.com/Pyle-PLMT15-Handheld-Photometer-Sampling/dp/B00EEJ...
http://www.amazon.com/Dr-Meter-Digital-Illuminance-Light-LX1330B/dp/B005...
http://www.amazon.com/Extech-401027-Pocket-Sized-Candle/dp/B00023RVNE

You may find them to be cheaper on eBay.

Some of these items may also be available via the usual overseas vendors (Fasttech, Aliexpress, Gearbest, etc.).

Rule 1-1 as it applies to life, take it as it comes.

bella-headlight
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Thanks for the heads up about getting a meter with a separate sensor Smile
As I don“t know how much use I will get out of a meter I have ordered this cheap $12, 200,000lux, separate sensor one http://www.banggood.com/High-Accurate-200000-Lux-Digital-Light-Meter-Tes...
If it gets much use I can always buy a better one & either way I haven“t wasted much money.

Ian

djozz
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bella-headlight wrote:
Thanks for the heads up about getting a meter with a separate sensor Smile As I don“t know how much use I will get out of a meter I have ordered this cheap $12, 200,000lux, separate sensor one http://www.banggood.com/High-Accurate-200000-Lux-Digital-Light-Meter-Tes... If it gets much use I can always buy a better one & either way I haven“t wasted much money.

I think that is a very good strategy as there are no guarantees that a more expensive luxmeter is as much better as it is more expensive. Unless you get to the hundreds of dollars category, where all specifications come with accuracy claims so you really know what you get.

When the meter arrives you could check for:
-calibration: does it give the approximate correct reading if a flashlight with ANSI-rated lux-specifications are measured (within 10% is already great, 20% still acceptable)
-repeatability: with same light source measured in the same set-up, does it give consistent results (in time, with varying battery levels, varying temperature etc.). I think this is the most important characteristic of any luxmeter, and I found that even very cheap luxmeters can have a good repeatability.

The Miller
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Hey, had that exact meter on order from a AliExpress seller, it was a deal 50% off
But it did not arrive and purchase protection was not extended so got a refund, still no meter though. I might just get this on instead (or at Gearbest depends on where the most points/discount is now.
Lol I have am old analog lux meter, that barely measures sunlight

bella-headlight
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The Miller wrote:
Hey, had that exact meter on order from a AliExpress seller, it was a deal 50% off But it did not arrive and purchase protection was not extended so got a refund, still no meter though. I might just get this on instead (or at Gearbest depends on where the most points/discount is now. Lol I have am old analog lux meter, that barely measures sunlight

Ha ha, copycat Smile

Ian

The Miller
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Hey! I ordered mine 7 weeks ago Silly

bella-headlight
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The Miller wrote:
Hey! I ordered mine 7 weeks ago Silly

Oh fair enough, I only ordered mine about 7 hours ago Smile

Ian

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Memory is also a handy feature if you are taking OTF measurements by yourself.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

Dutcheee
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I use the “lux meter” app from the play store. Seems to get quite reliable results on my Note 4, when testing with some ANSI specced lights I have.

And it’s free, how BLF is that Wink

I do wonder how it would withstand a side by side test with the mentioned meter though..

bella-headlight
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Well the meter has arrived, 8 days from ordering to turning up at my house in the UK, well done Banggood that is the fastest anything from China has ever arrived Smile
Now can anybody suggest a light meter app for an Android phone as I would like to reference it against something.
I will use a light with a known ANSI rating first to judge how accurate both the light meter & app are.
Oh & can somebody point me to good thread (or explain) on how best to use the meter & interpret the results please.

Ian

bella-headlight
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Ian

bella-headlight
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Ah well I have tried half a dozen times & can“t post a pic, again Sad
I don“t know what it is with this forum & pictures but of the forums I am on it is the only one I always struggle with.

Ian

The Miller
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Check one of the two other topics you tried it in, it is a matter of replacing a few symbols of the pics URL.

bella-headlight
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Done that the same as before & dosen“t work.
Have tried transferring the pics from dropbox to tinypic & tinypic says invalid code ?
The other forums I use putting up pics is simple this one is always a struggle.

Ian

bella-headlight
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bella-headlight
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There you go the above is the result.
It is so frustrating trying to post pics on this forum for me.

Ian

bella-headlight
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bella-headlight
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I am replacing ?dl=0 with ?raw=1 at the the end of the dropbox link as I did previously.

Ian

bella-headlight
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Managed to upload pic from dropbox to tinypic then to the forum from tinypic.
No idea why tinypic was refusing to accept the dropbox code earlier ?

Ian

djozz
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ah, there it is! Wink

The Miller
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Looking good!
I think the one I ordered must be much MUCH better Silly

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bella-headlight wrote:
I am replacing ?dl=0 with ?raw=1 at the the end of the dropbox link as I did previously.

You just need to replace dl=0 with dl=1.

If download is false (0) then it tries to pull us to dropbox.com. If you set download to true (1) then it does a download right into the page.

bella-headlight
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Well it“s just over 2 dollars cheaper but where is it Facepalm
BTW have you read the FAQ“s in the ad for yours ?
Says if you buy more than 5 pieces you get 95% discount !

Ian

bella-headlight
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Joshk wrote:
bella-headlight wrote:
I am replacing ?dl=0 with ?raw=1 at the the end of the dropbox link as I did previously.

You just need to replace dl=0 with dl=1.

If download is false (0) then it tries to pull us to dropbox.com. If you set download to true (1) then it does a download right into the page.

That is exactly what I am doing, I will do it again

Ian

bella-headlight
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Joshk wrote:
bella-headlight wrote:
I am replacing ?dl=0 with ?raw=1 at the the end of the dropbox link as I did previously.

You just need to replace dl=0 with dl=1.

If download is false (0) then it tries to pull us to dropbox.com. If you set download to true (1) then it does a download right into the page.

Oops misread that so lets try gain

Ian

Joshk
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bella-headlight wrote:
Joshk wrote:
bella-headlight wrote:
I am replacing ?dl=0 with ?raw=1 at the the end of the dropbox link as I did previously.

You just need to replace dl=0 with dl=1.

If download is false (0) then it tries to pull us to dropbox.com. If you set download to true (1) then it does a download right into the page.

That is exactly what I am doing, I will do it again
https://www.dropbox.com/s/6mxbwm8st5eouub/2016-03-07%2011.42.19.jpg?raw=1

Look at your quote, it says raw=1

bella-headlight
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Sorry yes but this is with dl=1

Ian

Joshk
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bella-headlight wrote:
Sorry yes but this is with dl=1 {width:80%}https://www.dropbox.com/s/6mxbwm8st5eouub/2016-03-07%2011.42.19.jpg?raw=1

Nope, still says raw=1. Replace raw with dl

Dimbo The Blinky
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Well, for one thing, https://www.dropbox.com/s/6mxbwm8st5eouub/2016-03-07%2011.42.19.jpg doesn’t seem to exist.

Also, in my limited experience, Dropbox absolutely sucks for sharing files in an open, public way. Maybe it’s just me, but when I tried to link the cute 404 pic above to the URL you provided (Quote this message for details) I get:

503 Service Unavailable
No server is available to handle this request.

But clicking it again seems to work. Or not, if I test it (in Preview) again. ??? Not-so-much negging, but Dropbox seems to be another of those shaky Google hive-mind hacks that never seems to get “finished”.

So what URL do you get from TinyPic or Imgur?

Do you use the Simple Post Editor? The orange-brown “Insert Image” button only needs a valid URL. The width and mouseclick boxes don’t technically need to be filled, just the Uniform Resource Locator of the image file itself.

“There is no darkness but ignorance.”

Joshk
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I’ve never used anything but dropbox my whole time on BLF and love it. However bella seems to have broken it, I can’t even log into dropbox.com! That’s a first!

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