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ORPHEK PR72 LED FRESHWATER PLANTED AQUARIUM LED PENDANT

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That is just marketing blurb Carl...

have a read here regarding colours, K ratings and the like. It's common knowledge that different colour bulbs don't do a great deal for plant growth. I know you are trying to sell em mate, but be prepared for these kinds of questions.

viewtopic.php?f=50&t=21442&start=10

ps i'm sure tehy're good enough to grow plants, i just don't get all the rubbish about reds and blues.
 
Thanks for posting the video and info Carl. I was surprised how large it is in reality. And the amount of light is pretty intense. They show it right on top of a tank in their pictures online, but I wonder if that would be wise. What PAR do you aim for in your tanks at the substrate? I have always heard 60 is considered a safe medium light. I've read midday sunlight can reach 1800~2000 µmol, but I would guess no more than half that underwater.

Couple of links re: spectrum and PAR for your enjoyment:
http://plantsinaction.science.uq.ed...-absorption-and-photosynthetic-action-spectra
http://plantsinaction.science.uq.edu.au/edition1//?q=figure_view/53
http://www.inda-gro.com/understanding-par.html (another nice chart)
https://growblu.com/research-and-development/measuring-light (halfway down the page is table 1 showing immersed vs. terrestrial PAR values)
https://growblu.com/led-grow-lights-perfect-spectrum (Again halfway down the page or more, great section on ratios of light for optimal growth, citing NASA and Russian experiments)

This is a collection of the best stuff I've found so far after weeks of ongoing digging. Still trying to find some values for sunlight in shallow clear water. Is it sunny in the UK?
 
There must be something in the different colours Ian as most LED companies is trying to get them into their lights. Fluval have just developed their new LED

Featuring 5 unique LED Band Waves for maximum growth and colour.

50% of the LED mix meets the optimal photosynthetic requirements of
plants supporting strong plant growth and condition.

100% LED spectral combination equals a complete multi-spectrum lighting solution for planted aquariums.

50% of the LED mix provides High CRI value for accurate colour rendition and perfectly balanced lighting.

460 nm Blue
640 nm Red
3000 K White
6500 K White
15000 K White

I think personally at the end of the day its all about "what works for you" if the colour looks good and the plants grow then thats all that matters.
 
Yeah I read it and I agree the Kelvin scale is a joke to plants. So are lumens and lux. PAR is all that matters. Leaving aside the huge variation in how various PAR meters actually respond, an ideal PAR meter should read all light between about 400-700 nm and call it PAR. But to a plant, light between 520-650 is basically junk, so they reflect it and we perceive it as their visible color. However you could read 1000 PAR on a perfectly functioning PAR meter from a 555 nm emitter and it would be all useless.
 
I'm locking this thread pending further review. Agents for products are not allowed to sell their wares. If the component is being marketed via one of our sponsors then the thread should be moved to that sponsors forum section. If an individual item is being sold then it should be raised in the For Sale forum section.

The original post indicates that the poster is marketing the product thereby qualifying him as an agent.

Cheers,
 
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