so this hasn't been touched on in ages but are the bazillion of LED fixture makers licensing technology from Orbital Technologies or did people all just ignore that and carry on?

Good question! Best I could come up with was an article that's already a couple of years old, but it looks like there are just too many new players out there for Orbital to prevail with their patent much longer. I suspect PFO lighting was merely the sacrificial lamb because they had the misfortune of being the first innovators to come up with a large controllable LED fixture. As far as I can tell, Orbital still hasn't come up with anything for Marine Tanks, but they do have some 'plant' growing offerings. Wonder if they've considered taking on some of the grow op light manufacturers??!

http://reefbuilders.com/2011/12/02/aquarium-led-patent/

Orbital's bogus patent was invalidated. So others are free to develop and market as they see fit.

Has anyone had any experience with Pacific Sun's LED/T5 combo fixtures (and knows of a dealer!)? I'm a big LED lighting fan, but I find the lighting so point source (especially with my Kessil) that shadows can become an issue. Adding T5 seems like a easy solution to that, but I'm not willing to spend over $1000 on the 24" ATI T5/LED fixture... just seems over priced.

I have! we subsequently dropped them from distribution. PM me if you want any further info but some previous end users may post their own experiences.

Good Day:

Here is an interesting article from Advanced Aquarist:

http://www.advancedaquarist.com/2012/10/aafeature

KInda lost me at

The light spectrum on the surface can be defined as a function I0(λ), where λ is the wavelength and I0 is the intensity for corresponding wavelength at zero depth. Hence the adsorption spectrum Ia(λ) at the depth D can be determined as
Ia(λ) = I0(λ) · K(λ) · D (1)

Does it say if I can grow SPS under LED?

I coulda told you that without all the math!!

One corona two corona three corona wwhat?????

No you lost me