Light measurements for terrarium

[SADE2020]

Hello All!

I need to understand what are the lighting measurements in the terrarium cool to warm. From Top tu Bottom.

And Also if anyone has a dracula or Masdelvallia tank... Would love to know the lighting measurements and kind of looking lights as well.

Footcandles or Lux aprox numbers form any app or professional meter.

Thanks you!

[estación seca]

I can't answer, but in the Terrariums forum I have seen lots of people describing their setups in great detail.

[SADE2020]

Yes thanks I've done it, but much of the info seems to be about humidity measurement, tricks and types of lights (brands and Watts) but not actual FC or Lux.

Thanks!!!!

[Tonio]

not to hijack your thread but:

Photone is a more then decent app for measuring light levels in PAR/ppfd, lux etc. On Iphone's it uses a simple paper diffuser and is usually less then a few % off compared to expensive PAR sensors. For android there is a Beta version out that has no need for a diffuser I don't know if it is equally reliable, but it should be better then other apps anyway. (it uses the front camera instead of the ambient light sensor. needles to say the camera is a way superior light sensor)

The problem with lux and food candles is that is based on the human eye. Which is most sensitive for light around 550nm (at daylight, at night with low light levels our eyes are most sensitive for 500 nm, that is why we feel moonlight is a cooler light source as sunlight, although it is warmer expressed in Kelvin)

Plants however can use all the light between roughly 400 and 700 nm. PAR (photosynthetic active radiation) expressed in ppfd (photosynthetic photon flux density) measures all those wavelengths equally instead of favoring one.

Lamps with higher Lumen/Lux can actually have lower PAR ratings then lamps with lower output in lumen/lux. This means that it could provide less or more light to the plants then you would think based on lux levels.

a second aspect is that intensity does not matter that much: a plant needs (and can handle) a certain amount of photons (light particles) per day. A shorter period with higher intensity or longer period with lower intensity can both provide that. DLI (Daily Light Integral) expressed moles per meter per day, is therefor the best way to compare lightning conditions.

The Photone app calculates DLI for you, assuming lighting conditions are stable during the day. In a terrarium this is usually the case since artificial lights are the main light source.

I have no interest in this app what so ever, but it is a free way (if you have a smartphone) to get reliable and comparable data that could be really useful for a lot of hobbyists. So felt the need to mention it...

[camille1585]

Originally Posted by Tonio

not to hijack your thread but:

Photone is a more then decent app for measuring light levels in PAR/ppfd, lux etc. On Iphone's it uses a simple paper diffuser and is usually less then a few % off compared to expensive PAR sensors. For android there is a Beta version out that has no need for a diffuser I don't know if it is equally reliable, but it should be better then other apps anyway. (it uses the front camera instead of the ambient light sensor. needles to say the camera is a way superior light sensor)

I have Photone on my work iphone, and just installed it on my android (had no idea that there was a beta version out!).

I have been very curious about the accuracy of the app, but the cost to unlock the LED measurements is a bit much, and there is no trial version... I also have an old iphone 6, so wonder if it is as accurate as newer models. I work in R&D at an indoor farming company and do a lot of trials with light and would be able to compare the PAR measurements of the app with those of high end quantum spectrometers.

I did test the android version just now with the B+R LED setting, and it is way, way, way off. I know that it is in beta, but I'm getting readings of max 120 μmol/m2/s at 40cm from the LEDs, while I know that the lamps were calibrated at 290 μmol/m2/s at that distance, at the start of the experiment. I will try to calibrate my phone next time a room is measured.

While I agree that it is better to measure light in terms of PAR, for the average hobbyist I think that lux and footcandles are much easier to handle, and good light quality meters can be had rather cheaply. There is also a lot of data out there on lux/fc values for various types of orchids. If the person buys decent quality fixtures with spectrums which are already geared towards plant growth (so not a generalist shop light type fixture), lux/fc measurments should be good enough.

PS: Did you notice that the app changed names during the pandemic? It used to be called Corona, like the solar corona.....

[Dusty Ol' Man]

That makes me wonder about Corona beer. Will they change their name?

[Tonio]

Originally Posted by camille1585

I have Photone on my work iphone, and just installed it on my android (had no idea that there was a beta version out!).

I have been very curious about the accuracy of the app, but the cost to unlock the LED measurements is a bit much, and there is no trial version... I also have an old iphone 6, so wonder if it is as accurate as newer models. I work in R&D at an indoor farming company and do a lot of trials with light and would be able to compare the PAR measurements of the app with those of high end quantum spectrometers.

I did test the android version just now with the B+R LED setting, and it is way, way, way off. I know that it is in beta, but I'm getting readings of max 120 umol at 40cm from the LEDs, while I know that the lamps were calibrated at 290 umol at that distance, at the start of the experiment. I trust the calibration as it's done by measuring 12 points per 1m2 table and values must be within 5% of target.

While I agree that it is better to measure light in terms of PAR, for the average hobbyist I think that lux and footcandles are much easier to handle, and good light quality meters can be had rather cheaply. There is also a lot of data out there on lux/fc values for various types of orchids. If the person buys decent quality fixtures with spectrums which are already geared towards plant growth (so not a generalist shop light type fixture), lux/fc measurments should be good enough.

PS: Did you notice that the app changed names during the pandemic? It used to be called Corona, like the solar corona.....

Yeah I noticed the changed name

I have not tested the android app, It might not be as accurate as the iphone version, just because of the wide range of hardware, and of course it is in Beta, Korona/photone on iphone was not that accurate at first to.

There are some comparisons between the iphone app and a quantum PAR- meter on

[joshy]

You could also pick up a relatively cheap lux meter and then convert the values into ppfd and dli. For instance, using the photone app on my iPhone 11 pro I get a lux value of ~950 while my lux meter puts it at ~7200 in the same spot.

Lux meter:
Dr. Meter(R) LX1330B – Luxometro digital, 200.000 lux, con gran precision, reaccion rapida y retencion de los datos : Amazon.es: Electronica

Lux to ppfd:
Convert Lux to PPFD - Online Calculator | Waveform Lighting

ppfd to dli:
Daily Light Integral (DLI) Calculator | Waveform Lighting

[SADE2020]

Originally Posted by camille1585

While I agree that it is better to measure light in terms of PAR, for the average hobbyist I think that lux and footcandles are much easier to handle, and good light quality meters can be had rather cheaply. There is also a lot of data out there on lux/fc values for various types of orchids. If the person buys decent quality fixtures with spectrums which are already geared towards plant growth (so not a generalist shop light type fixture), lux/fc measurments should be good enough.

.

Mainly because is easier I ask specifically about FC and Lux. Just average could give me an idea of what others are controlling.

Thanks all ...I still need some info got the actual question

[estación seca]

A phone app won't be accurate unless it's written for the operating system AND the specific CCD (charge capture device, the photon receptor) in the camera. A generic Android light sensing app would not work on all phones.