an interesting/ helpful thread on Radion... coming soon

[pieater]

If we examine that actual spectrum found at say 10m under the water, we would see that most of the spectrum does lie within this 400-500 range, while after this it drops quite dramatically with no sharp spikes over the spectrum. This represents the type of spectrum corals have evolved to utilise.

********. Name a SPS reef - any reef anywhere in the world where the SPS growth at 10M is better than at 5M. I've never seen one - and I've dived quite a few.

[Clearwater]

This is a very interesting thread

Sanjay did some great work

As I see it the Par we can measure the PUR is dependent on the

Species
Collection depth
Adaptability

Clearly the blue end of the spectrum is
Better for most corals

If we talk LED then it's Nm

When we talk MH it's Kelvin

When we look at T5 it could be either

Simply put we still don't know enough about the saturation point where we can have too much light or perhaps of the right wave length

Best we can do is to try and cover a broad spectrum of Nm and Kelvin

[jas]

Clearwater I have read everything I could find about Sanjay's MH testing and light...has he worked on LED?

[Javahart]

I use radium 20k MH bulbs and this reading roughly ties in with ones I've done.
so the radion LED unit gives around +80 PAR at 9" ?

for doing this

[Clearwater]

Hi Jas

Yes he has done work on LED as well and made the remark "a photon is a photon" T5 LED MH makes no diffrance

here is a link


Feature Article: LED Lighting Tests: Aquaillumination, Blue Moon, Eco-Lamp KR-91, Ecoxotic Panorama — Advanced Aquarist | Aquarist Magazine and Blog

[Clearwater]

I did a post, which didn't get much attention TBH about understanding light which I was hoping would provoke discussion

Kelvin and Nm. The relationship