Thanks everyone for the kind words.
JFlip, that would be me.
aquawolf,
They are a specialty metal halide spot light. Very focused with minimal spill...They will be lowered a few inches to get more PAR. Currently they are 4ft from the bottom glass and we are able to get very good coloration on our Acro's.
Here's some other info:
Tank
Our 90 gallon rimless aquarium is made from 1/2″ (13mm)
starphire glass, with 1″ (25mm) regular clarity glass for the bottom pane. It measures in at 24″ x 36″ x 24″ (60 x 90 x 60 cm) with a sump of 15g capacity.
Filtration
Flow is provided by a pair of modified
Tunze Nanostream 6025’s and an Eheim 1250 return. With head loss the return pump moves ~200gph (760lph). This makes for a very quiet drain and allows for 90% of the water to be directed into our DAS EX-2 protein skimmer. We incorporate a minimal amount of Live Rock, no more than 15 lbs (~0.45kg).
We dose our mixture of carbon sources and BioDigest, which has become known as The Glassbox VSV Method on the boards (Vodka, Sugar, Vinegar). This keeps nutrients low and allows for heavier feedings. For additional supplementation we also dose KZ’s Zeovit line and Aqua Vitro. We also run ROX carbon passively in the sump, which is kneaded on a regular basis to release bacterial “mulm” and remove deposits on the surface of the carbon.
For even more info and images check out our blog (link is in the signature.) If you click on the category "glassbox" it will have all posts regarding this system.

Cheers to the weekend.
Eric