The drivers I have but no word on the MCPCB’s at this point. I have been trying to get them to make them for months but so far just the prototypes were made and not much word since.
Correct, it is aluminum, forgot to mention that here, posted it in the other thread.
It should handle 70cri emitters as they do not pull as much current but I would not run an 80cri emitter on it but the truth is I have not tested them so I am guessing.
I never thought multi-die emitters were always wired in the same pattern.
It was just that the MCPCBs which needed to be wired in series or in parallel for 12V and 6V operation respectively.
BTW, do you have a Q8? I know you would love a Q8.
I think what we need is an interest list. In said list I would assume the price to be fairly high, a board that large is not going to be cheap to make (Probly $8-12 retail). If the number on the list is not enough that lumintop is interested in doing them, then we can just have them made elsewhere. I have a source we can use for DTP copper boards that we can use. Lead time from them would be like 4-6 weeks probly.
And when I said “we” that was me passing the buck, hinting strongly that someone with the word “Ace” or “Team” in their name should start one. :student:
So why use a simple DD driver when you can buy a low volatge dropout (250mV @8A) buck with better regulation than a crude DD?
So this DD cant regulate current on 8 fresh VTC6 not to torture the LED possibly at 10A or higher
if carrier got bypassed by then we go up to 12A LED tuning blue and dies
then the output will drop and lifetime gows downhill
Its not hard to run 8A constant on 8 cells, if the original GT buck chip gets latest gen P-MOSFET with half the gate charge and 1/3 of the resistance
So we can keep the switching frequency of around 400kHz, cut the inductor value to 1/4 to get enough ripple to meet the buck chips minimum ripple that is noted in datasheets
Bridge carrier button springs to minimise voltage drop on that steel spring
left original GT calculation;
middle resistor mod pushing the driver over the rated specs, regulation can break down as the minimum ripple not met;
right proper sized driver with upgraded parts
cold start lumens on 9A may look impressive but sustained output is marginal higher than on 7A, even on 6A the LED pushes out a lot lumens with 33% less heat than on 9A
TA himself tested it
Incredible readings. One of the best throwers and it still has 8000+ lm output. Exactly my idea of a compromise between throw and flood How long can 3000 mAh cells withstand such current draw? And how fast does it heat up?
If we get enough interest, would lumintop be able to sell the entire thing as a separate head so those of us who already own a GT can just swap out the heads?
I know the head is probably 95% of the price, but it would be nice not having to solder every time you want to swap LEDs.
Either way, if there is a list somewhere, I’m interested.
How long can 3000 mAh cells withstand such current draw? And how fast does it heat up?