Recent content by Davidbarrel

Mr. IRstuff are you ok? i made a simulation......after i made thermal test in laboratory with the real Led!

yes you hit the mark! i will try to put a layer between the led and the heat sink. are you able to use siemens nx for cfd analisys?http://files.engineering.com/getfile.aspx?folder=fe378964-4557-4b62-8eae-9c46598c17db&file=cxb2530.JPG

i tought in this field we could discuss about the cfd analisys for the led thermal behaviur

during my analysis i assign the power (heat genereted) to the led, the material of the heat sink etc etc but i am wondering wich is the factor that i must assign to identify two different kind of led that have different thermal resistance?

Yes i think like you Ve1bll, maybe the efficency is a part of the answer but the gap is too big. The cree led is cxb2530 It has an output of 4200 lumen at 1050 mA and the vf misured is 35.6 v. I used the same thermal pad for both Also the cri is the same

thanks for the reply i double checked, there are the same Vf, they work at 1000mA and have around 35.6 Vf. you can find anything in internet :) best

hi everyone i made a test, i assembled two different type LED (citizen/cree) on the same heat sink, the power of the LED is same (36W) but in the first case i got a temperature (TC) of 70 °c in the second case i got 90 °c....so what the reason of this gap? how can control this behaviour during...

hi everyone i made a test, i assembled two different type LED (citizen/cree) on the same heat sink, the power of the LED is same (36W) but in the first case i got a temperature (TC) of 70 °c in the second case i got 90 °c....so what the reason of this gap?? thanks have a good dday

Hi guys Is right talking about the inrush current in a circuit composed by a power led and power supply ( 700mA costant current output )? If yes ...how can i get this value? Thanks in advance

Hi guys I have to resolve a fea analisys ...all go well but at the end in the solution task i can't find the result for the bending moment Nm ...can you help me Thanks in advance

Thank you very much!

I mean something like this below https://www.vossloh-schwabe.com/uploads/tx_sbdownloader/_LED-Konstantstromtreiber_EN.pdf Regards

Hi folks, Regarding the object, is an induttance load, capacitive load or a resistive load? Thank in advance

Thanks a lot...keep in mind your advice

Hi folks I have to make a project for a first time, the point is to evaluate the electric motor that make up and down to a chandelier that weigh is 300 kg, i have to find also the way to disconnect the power of chandelier each time i get down or up it...also the balancing of it is a matter Have...