• How to view the spectrogram of lamps

  • Nicholas

This topic was somehow discussed by me with my friend - and I think it originated with him - about how to view the spectrogram of lamps. Just a suggestion! Turn on the lamp, wait for it to fully warm up (better to let it run for at least a day). Take a proper photo in RAW (or RAF or ....) And look at the lamp's spectrogram in the same Photoshop (I understand that the spectrum will be clipped at the ends, but still). Will it be interesting to see if it matches? By the word spectrogram, I mean this -

Ashley5975

I recommend checking the topic on . There is a link to a website where you can build a complete lighting spectrum, knowing its components (by LED brands and, in my opinion, fluorescent lamps).

James1625

There is an interesting topic about the spectrometer. I managed to do it.

Brent8919

In my opinion, my option is simpler and faster.

Randy

Have you tried it? If not, then why say "easier and faster"? Maybe it doesn't work at all. Are you aware that a digital camera distorts color reproduction? More precisely, it changes it.

Karen1649

Unfortunately, it's not just digital. The DSLR also doesn't get along with the diodes. I asked a professional friend to come with her expensive device. She jumped around the aquarium for 2 hours. You should have seen her eyes... They even covered the bottom with office paper. Her words: live and learn. So far, she hasn't encountered a problem she couldn't solve. And then this happened.))) Nothing useful came out of it.

Emily3506

I haven't tried my method yet, but I think it will work more accurately than a webcam!

Christopher7213

If it's not too much trouble, please justify your categorical post. (I'll give you a hint - the sensor in a camera is theoretically at least better than in a webcam) By the way, it's unknown how much the webcam adds its own color distortions. Best regards.

Karen

I understand that you want to write something, but I ask you once again to read the first post carefully (I highlighted it in blue). P.S. If you don't have a camera, invite a friend over who does. Best regards.

John3142

Where to watch?

Alicia5489

Disperse the light with a prism and orient yourself by the width and brightness of the bands.

John

Igor, is this in Photoshop or what?

Chelsea

Well, yes, RAW mode, without any correction. I think determining the actual spectrum in post-processing would be incorrect, there are too many factors to consider. For example, photographing in the dark, my white balance goes only up to 10,000K, and so on.

Karen1649

Well, even in this approximation, it's enough for us. Take a photo of some economy model for comparison. And I'll try on my camera in the evening, but I don't have RAW mode on my Canon D-10. I'll try in different modes.

Alexandra

Well, here for comparison.

David2398

It looks very much like the truth. And where is this done in the shop?

David953

I don't know, I just open the RAW file in Photoshop and it already opens in a new window. But probably like this - file, open as..., choose Camera RAW.

Alexander

The photos are not taken correctly - ideally, a white surface (coated paper or similar - something that won't add its own color and won't absorb parts of the existing one) should be evenly illuminated by the light source.

Antonio

The program gives different results on different cameras; it's more like fun than information.

Joseph8842

So it turns out it's not that simple? The paper is not the right one, the shade is off, in short, this method is quite conditional. A spectrometer is needed.

Monica

Is the paper coated? What exactly are the conclusions based on? A spectrometer is needed - of course, if this is a factory-made device.

Jesse3979

The computer analyzes the spectrum captured by the camera, and there, a leaf is not just a leaf, but food for thought.

Laurie3842

Why do you think so? Please explain if it's not too much trouble.

Nicole7122

Because even in different settings, the photos yield different results. In various shooting modes, balances, etc.

James5103

Correctly photograph in RAW (or RAF or ....)

Brent7831

How can you determine if a photo is taken correctly or not?

Tammy2040

It is important to consider the fact that the camera's sensor does not understand where white is, so the colors you set in the modes will be the colors you get.

Heather

Take a proper photo in RAW (or RAF or ....) Try to look for information about this recording format on photography forums (no links provided, and the wiki is general information, so to speak).

Christopher

According to the histogram on the preview. By the way, theoretically, nothing else is needed - but I don't know exactly where the camera gets the information and at what stage (in terms of before or after processing the functions and settings of the camera's brain).

Leah

Comparing - "Well, it looks like the manufacturer's spectrograms." To understand the histogram (if it's easier for you to process the information) - try to virtually imagine these scales (or, as a last resort, print them on transparent film and overlay them). In principle, the scales are unnecessary - the idea is that you can look at an approximate spectrum and understand whether the information printed on the lamp packaging is truthful or not (this is my assumption).

Charles894

If I have the manufacturers' spectrograms, why do I need to take them "in nature"? I need to know the spectrum where the manufacturer doesn't provide it, to understand whether this lamp can be used in an aquarium or not, or to check how well the manufacturer adheres to the stated parameters. Without scales, this is a drawing from a cartoon, not a spectrogram.

Daniel4967

I don't understand why you need all of this (How to view the spectrogram of lamps)? From all your topics and posts, I gathered that everything is already great and wonderful for you, and your marine aquarium or aquariums are thriving without any complexities (sumps, good lamps, etc., without anything at all). For example, this spectrogram is of no interest to me and my sailor friends.

Kenneth7331

Think about it - if you have a reference on the packaging and your photo matches that reference, what will happen if you photograph a lamp that doesn't have a reference on the packaging? Just sharing my thoughts!