Spectrum of manufacturers new LED.

[Tony Thompson]

HI @Dana Riddle I have recently recieved a Spectrum graph from a manufacturer of a new Reef LED. I am a little confused as they seems to be a large number of separate peaks. Is this s sign of bad blending as all other Reef LED spectrum graphs seem to have less separation between peaks. Thanks

 

[Dana Riddle]

HI @Dana Riddle I have recently recieved a Spectrum graph from a manufacturer of a new Reef LED. I am a little confused as they seems to be a large number of separate peaks. Is this s sign of bad blending as all other Reef LED spectrum graphs seem to have less separation between peaks. Thanks

Blending (or lack thereof) could cause those multiple peaks, but it could also be due to the number of LEDs with distinct spectral qualities causing intense peaks. Nothing to be overly concerned about, IMO.

 

[blasterman]

HI @Dana Riddle I have recently recieved a Spectrum graph from a manufacturer of a new Reef LED. I am a little confused as they seems to be a large number of separate peaks. Is this s sign of bad blending as all other Reef LED spectrum graphs seem to have less separation between peaks. Thanks

It means they are being honest. Spectral graphs are normally 'spikey' but in most cases they just blend the peaks in Excel. Spectrometers also typically interpolate data to some extent artificially smoothing the peaks and valleys due to their limited resolution.

Really expensive spectrometers show more detail because they have higher resolution DACs.

LEDs can't blend colors they don't generate. If you have a 400nm LED and a 450nm LED you can diffuse them all you wont. There will be no 425nm light.

And, I will say it again. This 400-450 violet obsession is industry contrived hogwash that has nothing to do with growing coral.

 

[oreo54]

It means they are being honest. Spectral graphs are normally 'spikey' but in most cases they just blend the peaks in Excel. Spectrometers also typically interpolate data to some extent artificially smoothing the peaks and valleys due to their limited resolution.

Really expensive spectrometers show more detail because they have higher resolution DACs.

LEDs can't blend colors they don't generate. If you have a 400nm LED and a 450nm LED you can diffuse them all you wont. There will be no 425nm light.

And, I will say it again. This 400-450 violet obsession is industry contrived hogwash that has nothing to do with growing coral.

Actually LED's "spread" more than you think.
Way more than say the pure Mercury emission lines.

Green LED's not only are horribly inefficient their nm spread is wide..

Don't make me find really precise 1/4 nm by 1/4 nm charts of monochromatic leds to prove this please..
CHART

You have about 15nm effective wavelength range from peak (spread around .4).
Some spread more than others by nm and manuf.

LEDs on Metal-Core PCBs

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Check the FWHM measurements..

 

[Dana Riddle]

It means they are being honest. Spectral graphs are normally 'spikey' but in most cases they just blend the peaks in Excel. Spectrometers also typically interpolate data to some extent artificially smoothing the peaks and valleys due to their limited resolution.

Really expensive spectrometers show more detail because they have higher resolution DACs.

LEDs can't blend colors they don't generate. If you have a 400nm LED and a 450nm LED you can diffuse them all you wont. There will be no 425nm light.

And, I will say it again. This 400-450 violet obsession is industry contrived hogwash that has nothing to do with growing coral.

Would you care to defend your position on violet light /coral growth being 'hogwash'?

 

[Tony Thompson]

What does the figure of 7600 on the top of the Y axis represent? Also there seems to be a lot of light below 400nm - 375nm is this useful to corals at that wavelength or just a waste. I can also add this light has a $800+ price tag for something designed for a 60 cm aquarium seems a bit much. 164W.

 

[Tony Thompson]

I would normally refer to this diagram for useful coral spectrum. The spectrum of the light I mentioned above seems to be a little all over the place. They seem to be saying how great this light is and comparing it to the Red Sea Reef LED 620. What are your thoughts on the spec of this light considering the price bracket.

 

[Dana Riddle]

It means they are being honest. Spectral graphs are normally 'spikey' but in most cases they just blend the peaks in Excel. Spectrometers also typically interpolate data to some extent artificially smoothing the peaks and valleys due to their limited resolution.

Really expensive spectrometers show more detail because they have higher resolution DACs.

LEDs can't blend colors they don't generate. If you have a 400nm LED and a 450nm LED you can diffuse them all you wont. There will be no 425nm light.

And, I will say it again. This 400-450 violet obsession is industry contrived hogwash that has nothing to do with growing coral.

Blasterman is correct that LEDs won't blend when observed with a spectrometer.