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You can sand it to make it smooth .. does not have to be mirror polished ,though ... Test the flatness with a (old fashioned) razor blade ... Yes,you will have to clean it with isopropyl alcohol ,before mounting the COBs.. Check out my favourite beach .Half an hour away from home ..Really...

The whole country is beautiful ... Other than that it's really a shithole to live .... Only thing left in one piece , is natural beauty ... Ok ..And food also ...

Take a glance of where I live ...:wink:

If screws untighten so much that " cob screw wiggle lose on its own " , then your COB is going -most probably- to be fried ... Check your COB /holder screws every 6 months or so and I bet that you will find some that are not tighten the way that used to be ... Thermal expansion...

Nope. While yes,copper wires are copper wires ,for most of electric/ electronic appliances , for the audio world ain't that simple .... Guitar cables ? Try out an ordinary $10 cable and then play the same tune with the same amp with a Monster Rock or Monster Jazz cable ... If you have good...

1) Moisture got in ,while washing the tapping lub & debris off ... 2) No,ain't gonna happen quickly ,as in aerospace or marine environment 3) Obsolete ? Depends on the light ...The lights I make won't be obsolete easy ... Maybe after years new drivers and fan ,would replace the old ones ...

I used to work in Military Avionics industry.. Galvanic corrosion does take place in a grow light . As also takes place in relatively dry environments ,with presence of electrolytes or ions from gasses. It just needs more time ,than " sea water and structures that sit in weather and get wet a...

Here,in Greece ,usually amongst the bikers ,Titanium is also called Putanium . From the italian word putana . ( Putana means prostitute ) It's called Putanium ,'cause one has to become a prostitute in order to buy Ti screws or parts ... (:

Galvanic corrosion maybe more common in aerospace & marine environments ... Still it can be very easily present in a grow light ,too . And you won't be able to notice it very easy ... It usually forms inside the threads ,making the screws go loose , with the aid of thermal...

Heat issues ...(material gets soft ) & Not able to withstand high torque (which is needed in order to ensure high contact pressure ) (elastic polymers all of them ) Press "pause " and think it over ... A grow space is a pretty humid environment ... With plenty of corrosive gasses ... (...

Personally ,I wouldn't use them ... Especially the M3 size ...

I had almost the same info ,about a year ago by a friend who works in Shenzhen city. Was something about " Faulty Cree COB lot that should have been destroyed " due to " LES silicone material issues" (not Vf aka chip issues ) , but they ended up in " asian grey market " *.But he did not...

Aluminium screws are called " Ergal " or "Zicral " screws ( Al alloy 7075 ) and usually they are anodized with vivid colors . Not very easy to find the M3 size ( which is extra prone to breakage ). Also ergal screws corrode pretty easy ... https://en.wikipedia.org/wiki/7075_aluminium_alloy...

Moreover .. You do not have to drill all the way through .. To attach a Vero series COB or a CXA/CXB holder a depth of about 6-8 mm is enough . Crucial thing is to use stainless steel (INOX / ROSTFREI ) screws/washers ,in order to avoid galvanic corrosion of Al . Avoid galvanized or plain...

https://www.rollitup.org/t/meanwell-led-drivers-3-in-1-dimming-function.838760/ https://www.rollitup.org/t/3in1-dimming-part-ii-a-more-advanced-approach.855193/ Cheers.

As @alesh mentioned : Most common 100K pots have a tolerance of 10% if not more and almost always they are under 100K ( 80-90 K ) . That's another reason * you will have to connect a 10 K ( <= min value ), "limiter " resistor in series with the pot. So, their resistance will add up and reach...

(...) Well, I certainly was a noob (not sure how it's improved). I was just desperately searching for a 4.7K resistor (didn't find it) and came across remnants of my first LED grow light. 3W of brutal power :) (...) :P My first high power led grow light : (Cheapo 1W LEDS : NW 4000°K - WW...

I'm gettin' my drivers at Kutop ..Hong-Kong ... (Original MWs , no receipt inside the package ,no taxes ,no customs ,20€ shipping fees ) But not the best prices ever I guess ... https://kutop.com/led-driver/hlg-c-series.html Still ,I'm unable to trace my favourite HLP drivers anywhere else...

We were noobs ourselves ,once upon a time ,brother .. But I've the feelin' ,that we used to do more extensive research ,than the today's noobs ... Or maybe we had better "gurus" (see @guod ,for example) ,than we 're ourselves ,today ... Anyway ... I might start writin' a book about "Solid State...

Again ...And again ....And again ... FGS ,read the fuckin' report ,for the HLG 185H-C-1400B ,at MeanWells site .... When nothing is connected at Dim wires (no pot ,no resistor ...just nothin' ) , Most -if not ALL- the CC drivers featuring 3in1 dimming ,output more current than the rated ...