Hey
@GreenSanta
didn't mean to poo all over your thread...I just see a reply and gets to typin' away
Imho...you should consider the CXB3070 3.5K BB...or maybe even the Vero 29's?
The BB is for the bins, as mentioned above, basically just increased effiency and overall output in order of magnitudes as go from lower bins to higher bins....I believe BB is top bin right now for top Effic and output for a 3500k spectrum from Cree...and basically the same pricing as lower and older bins....
I believe you could find a heatsink length from HeatsinkUSA.com that jives with the your fixtures dimensions..i.e. the individual dimension of each cluster x16, from that 1st light you described...Maybe you can run an 6" piece for example for 1x cob...that will fit into your housing and the fan will blow on it [don't know your exact dimensions, but hopefully you get the idea...]
Right, so if you don't know, Volts x Amps = Wattage....
Take the wattage you need for each cob [for example 1x CXB 3070.....@700ma =24.xx watts @1050 =38.xx watt @1400= 52.xx]
I use Supra method taught to me to measure how many watts a piece of Heatsink from HeatsinkUSA would be able to cool both Passively and Actively....
Under each specific length of profile is
Surface AreaCm^2....... this is per inch of that type of profile....For instance... the 5.88" profile is probably the most popular around here...in the thumbnail...it says
260.01 cm^2.....The other quick guidelines are::::
40cm^2 = 1 watt ACTIVE cooling
.....or 110 cm^2 = 1 watt PASSIVE cooling.....
So 1" length of 5.88" wide heatsinking would be good for about 260/40 = 6.5 watts cooling Active
260/110 = 2.4 watts of cooling Passive....
Maybe you need a 6" inch piece for each of the 16x clusters....Actively cooled, each 6" long/5.88" wide heatsink would be good for 39 watts or so...Just for example....Hope that Helps....