Here was my first attempt at intra/lower canopy lighting. on paper I've revised this design a bit but since moving I have yet to start my grow up again so I haven't actually built version 2 yet. the pvc 'pole light' in the below pic - i call them bud sabers.
http://imgur.com/EH219DU
Was trying to grow 9 plants in a 3x3 space (standard 3x3 7" deep flood table). my thought was i would need some form of light between each bucket as i was going to be packing them in pretty close together and not trying to keep them as short as possible so the lower branches would be fairly starved for light. i figured the 5630s put out quite a bit of light and this might add enough light down low to make a difference.
some things conspired and the grow in the pic didn't go as planned causing me to lose a few plants (stupid males ...) so i didn't really get much useful data from the grow. these bud sabers are extremely bright despite not looking all that bright in the pic. my revised design will be much shorter and instead of 3/4" PVC I will be using at least 1 1/2" aluminum pipe for the thermal capacity as well as superior heat transfer. These 5630 LEDs do heat up and when they do they lose a bit of light output and the adhesive breaks down. My hope is the aluminum pipe holds and transfers heat better. With the shorter thicker pipe I should be able to drive the same amount of 5630s as in this pic off a 100W 12v supply and have enough power left over for a 12v PC style blower to mount on the top of the pipe - drawing air from just above the hydroton in my flood/drain aquaponics. so drawing nice cool air up/through the tube and exhausting it up above the canopy.
should be starting my grow again soon, this time with 3 DIY lightbars using 9 gen 6 v29s. I'll have 750w of 4000K v29s and then will use the bud sabers @3500K once the canopy fills out and the plants get enough height. Since I'll be doing 9 buckets in a 3x3 grid my experiment will have the bud sabers on one side of the 3x3 and I'll see if those plants produce more than the plants on the other side. the middle row then in theory should also bulk up more on the bud saber side.
worst case nothing 'good' occurs and i spent $100 on 5630s and power supplies for nothing - but learned something in the process. Once i get going again I'll do a journal if anyone is interested.