Lux for nano?

[taj0930]

Have a standard $15 lux meter. What’s a good surface lux for a 12” cubed nano?

 

[Dan_P]

Have a standard $15 lux meter. What’s a good surface lux for a 12” cubed nano?

2000 Lux would be a low light level, but keep in mind that this is a measure of light intensity centered on 529 nm (I think) and does not tell you about the intensity of wavelengths needed for photosynthesis. If you have a light designed for coral, then you might use Lux as a starting point. Someone will give you a better answer.

 

[oreo54]

Have a standard $15 lux meter. What’s a good surface lux for a 12” cubed nano?

Ok bear with me a bit..
Say you had a 6500 k light and all the light falls on the 1ft square surface.
You would need 20000 lux to hit 270 par on that surface.

Pure blue light (450nm) and you would only need
2500 lux for approx the same par.

Convert Lux to PPFD - Online Calculator | Waveform Lighting

Online calculator to convert illuminance (lux) to PPFD (micromoles per second per meter squared).

www.waveformlighting.com

Just how lux meters are calibrated .

You can see the difficulty and that will only get you the surface measurement.
Errors increase trying to free air measure it
In tank ( even dry) can alleviate some of
this but not all.

Or you can just search out some numbers.

If you want to play or experiment. increasing 2500 lux is around 50 par.

Lux range for SPS reef tank

"Galactica" is the name of the app? What lamp gave a 200,000+ lux reading?

www.reef2reef.com

So 5 x 2500 (12500 lux) is 250 par.

Lux meters to check Led????

Would somebody please tell me what kind of Lux Meters are on the market so I can check my tanks Hydra 26 lights?? I have 4 Hydra 26hd's over my 125g (72×24×18) and I'm going to get me a 220g or larger tank by the end of the month and I'm burning up corals..acro's that is.. I need to check the...

www.reef2reef.com

A basic lux/par conversion constant for led at a 1;1 ratio is 60. Ie 6000 lux = 100 par. as the color changes to a more blue spectrum the constant is higher 65-75.
A typical MH say 20k radium bulb is around 50 as a constant. (some much lower) so 6000 is 120 par
Most t5 fall much lower in the 40 range. 6000 lux=150 par

If you wonder why a 450nm blue led is 2500 but a very blue reef light is 12500 consider the below lux sensitivity chart .

It’s Not All Sparkle. It’s Spectrum and Cosine Correction: Your Guide to Buying a Light Meter - kW Engineering | Sustainable Buildings & Energy Efficiency Consulting

In a previous post, I wrote about smartphone apps and their inadequacy with respect to illuminance measurements (that is, their ability to measure footcandles or lux). That post took a deep dive into why smartphones are not up to snuff as a professional light meter. As I wrote that post I...

kw-engineering.com