I would like to do a runtime/ output test of a lantern. I plan to place it into a white spackle bucket, and take periodic measurements.
Which app, would you recommend?
Which app, would you recommend?
Hmmm, that doesn't sound right. The Tab-4 has a two cameras (front & rear), correct? If so, it has to have a light (exposure) meter of some kind. As mentioned, you might have to try a few to find one that works.I have been looking for one as well but then discovered my Samsung tab 4 doesn't have a light sensor
Hmmm, that doesn't sound right. The Tab-4 has a two cameras (front & rear), correct? If so, it has to have a light (exposure) meter of some kind. As mentioned, you might have to try a few to find one that works.
1. Light Meter V2.3 (Borce Trajkovski). This is a nice app, and one of the few (only?) that I've come across that measures color temperature as well. It has the most calibration options of any I've found too.
I'm using "Light Sensor", seems to work ok; certainly no frills.
It does have a calibration function but I don't have a way to take advantage of that. :shrug:
I didn't understand the guage, and my readings were a bit erratic, (that was my fault). It would be cool if the graph setting could be changed to take a sampling every so many minutes, rather than milli seconds.Light Meter V1.2 (Keuwlsoft). This one is pretty cool as it has a real-time graph function, as well as min/max/avg. readings, which are very useful.
I will try those, I'm not sure which ones I have tried but I know I downloaded about 5 and all of them said not compatible with device when I opened the app.Hmmm, that doesn't sound right. The Tab-4 has a two cameras (front & rear), correct? If so, it has to have a light (exposure) meter of some kind. As mentioned, you might have to try a few to find one that works.
I have a few installed that work great (Samsung Note 4):
1. Light Meter V2.3 (Borce Trajkovski). This is a nice app, and one of the few (only?) that I've come across that measures color temperature as well. It has the most calibration options of any I've found too.
2. Light Meter V1.2 (Keuwlsoft). This one is pretty cool as it has a real-time graph function, as well as min/max/avg. readings, which are very useful.
3. Lux Meter V1.2 ((Not Quite Them). This is a very simple lux meter with a large display that is a lot easier to read than the previous two at distance. It also has a min/max feature.
:thumbsup:
Good info, thanks!There's two types. Some makes use of the ambient light sensor. This is the better option as the sensor generally gives you a straight lux value. The bad is that IR can affect the lux value as generally the sensors measures IR as well. That value needs to be then adjusted for the "green" visible light in software. Some sensors also are not linear.
The other method is via the camera and spot weighting and other calculated methods. It's a reasonable fall back if that's all you got. Better once calibrated.
It also supports some hardware sensors too. I tend to try this one first on my phones. Not sure about versions but it supports froyo (2.2) in the one I got.
Lame! Yeah, as Mr. Floppy pointed out, there are 2 types on sensors (duh), and the majority (all?) of the decent light meter apps use the ambient light sensor. Since the Tab 4 has no ambient light sensor, it would appear you are SOL.Tried all of the ones mentioned by freefly and everyone of them tell my device does not have a light sensor, guess I just have to buy a standalone unit.
Lame! Yeah, as Mr. Floppy pointed out, there are 2 types on sensors (duh), and the majority (all?) of the decent light meter apps use the ambient light sensor. Since the Tab 4 has no ambient light sensor, it would appear you are SOL.
The first one I listed actually has a calibration setting/recommendation listed for the Galaxy Tab, so I guess that must be for the later/newer ones. Time to upgrade I guess!
FWIW, I think the Tab S (and probably anything after) has an ambient sensor, as well as an RGB sensor. So, in theory, that would give you the hardware needed for the light and color temp meter apps. Obviously, I'd want to confirm that before shelling out the cash for a new tablet!
Front facing camera is 5 mega pixels and the rear camera is 12 mega pixels.
I get different results also using an iPhone 4 between the front and rear camera
Yes, Energizer and others, when testing the capacity of their batteries for publication, often put them under load for about 5 minutes an hour, for eight hours a day. They spend more time resting than working.^^ I agree, it could be the app and/or phone or...
I've seen in a number of cases in flashlight reviews where batteries cause a spike in output well into it's runtime, then begins a steady decline.
Also in the old days using wack-a-lot lights there was an unwritten rule that when the light got real dim turn it off and wait a while. Then upon re-lighting the batteries seemed to have developed a 'second wind' if you will.
EDIT.... at 264 hours it was at about 0.1 lumen
EDIT... 64 hours later it was still at about 0.1 lumen (328 hours)
I'm not a low lumen junkie, and I pulled the plug. I wanted to get to the switch, so I could look at perhaps adding a constant current driver. I found that I can, and ordered one. I'll try to write up the modifications once the parts come in, and I get a chance to play with it.
EDIT: Oh no... after letting the batteries rest for 7 hours, I hooked them back up, and it is putting out about 2 lumens. That's actually plenty for a small room, like a bath-room.
EDIT: Here we are another EIGHT days and nights later, plus 12 hours. An additional 208 hours of light and it is down to about 0.1 lumen. So at this point we are at 532 hours. I'm going to let the batteries rest for the day.
EDIT: I let them rest for 12 hours, and it went back up to about 1 lumen. So here we are another 10 days plus 10 hours for an additional 250 hours. Its at about 0.1 lumen. 782 hours in total so far.