VaughnH;38276 said:My tentative guess is that moisture between the star mount and the heatsink may have been involved, or the star mounting is not well done by the assembler. Tomorrow I will figure out what next. Any suggestions? Is there a relatively easy way to electrically isolate that one - with a mica shim, for example? Or would it then overheat?
Not overly sure what the 'grounded' malarky is as I am no electrician. lol
All mine are screwed in using the same screw as you and the heatsinks are well and truly touching the stars Each LED is seperated though as the heatsink/LED combos are mounted on an acrylic sheet
As for the moisture issue I think the 'splashguard' is the key thing. Will stop moisture coming into the unit, stop the fans creating more evaporation by cold air escaping downward, keeps all the fans cold air running through the luminaire, and as a 'just in case' I have my fans set to come on 15 minutes before the LEDs to dry out any moisture there may be in the unit.
I was told never to wire high power LEDs in parallel, always to do them in series!!!
A couple of threads I was using and getting good info/feedback from:
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Diy Whole Tank Led Lighting Retrofit - Tropical Fish Forums
On the strobing side of things, when I initially set mine up 6" above the water as the T5HO setup had been it sent my eyes 'wappy'. Its fine now it is 15" above the water much more like the 'glimmer/shimmer' of MH. One factor is the surface water movement I (and you) use. No surface disturbance removes the glimmer