All Questions
32
questions
0
votes
2
answers
153
views
Is my heat sink properly sized for my LED strip?
I am looking for some help in sizing a heat sink for an LED horticulture light I am building. I will be attaching two Bridgelux BXEB-L1190U-30G3000-C-C3 LED strips side by side, link below to specs, ...
- 1
0
votes
1
answer
100
views
3 W Power LED without heatsink (350 mA)
Can I use this Prolight Opto PK2N LED at 350 mA without a heatsink?
- 77
2
votes
1
answer
98
views
LED lights become darker? [closed]
I build myself a light with many small LEDs. They are quite powerful. I superglued ever LED board (the LEDs where in parts of 3 on a small circuit board) to an aluminium piece to dissipate the heat.
...
0
votes
1
answer
838
views
How do I use a heatsink in a sealed enclosure?
I'm working on a project with a set of individual LEDs (datasheet) permanently set up in an outside setting in winter, at night.
I need to build separate enclosures for each of the LEDs because they ...
- 19
1
vote
2
answers
234
views
What power supply do I need for this LED driver?
I'm putting together a project where I'll be driving 4 x 10W RGB LEDs (these ones) with one PicoBuck LED driver. I'll be using all three channels on the LEDs at the same time and controlling dimming ...
- 19
0
votes
1
answer
34
views
is connecting high end high power leds in series feasible and are there light quality or other issues
i'm building high power high CRI cine lighting mostly to illuminate softboxes and have chosen Cree XLamp CMT2850 LED 1400mA 36V (Fidelity 95plus CRI).
I plan to build about 12 units for the studio.
I ...
0
votes
1
answer
728
views
Can I choose a heatsink based on its thermal design power (TDP) for cooling LED chips?
I am confused about TDP ratings and what they refer to actually.
The reason I am confused is because most modern CPUs and GPUs, although not ideal, are able to sustain very high temperatures (80 C or ...
- 426
1
vote
1
answer
155
views
Heatsink to dissipate 170W
I am planning to build a light from 12 LEDs (CREE XML RGBW). These are 4 diodes on one star - a red, a blue, a green, and a white - with a total forward voltage of 13.9V at 350mA. Is there any kind ...
- 15
0
votes
1
answer
325
views
Does LED thermal need to be isolated from GND in this case?
I'm designing a small LED device which is powered by a battery.
The case of the device is acting as the GND line between the battery and the LED driver, but it is also acting as the heatsink for the ...
- 3
1
vote
3
answers
3k
views
Using a small heatsink with a high power LED (50W)
Description
I want to use a 50 Watt LED like this one (42mm*40mm)
The space to integrate this component is limited. I have only 55mm*55mm*30mm in total.
So the LED + Heatsink size must not be higher ...
- 115
0
votes
1
answer
455
views
What temperature should I expect by lighting 3W-LEDs?
I have a PCB with 10 LEDs (reference : SPHWH2L3D30ED4TPK3) which will each dissipate 3 W (forward voltage of 3 V and 1 A passing through). The PCB is a circle with a diameter of 20 cm and LEDs are ...
- 659
1
vote
1
answer
369
views
Arduino RGBW 24v LED strip driver
This might not even be the right place for me to ask, but I hope somebody can help;
I have an arduino mega with 4 PWM outputs (5v, fitted with 220 ohm resistor) that I would like to use to control ...
- 11
0
votes
1
answer
687
views
LED ULN2803 thermal / heatsink questions
I'm intending to use LEDs of 5mm, which have a max forward current rate at 30 mA, or a value of 100 mA, with 10% 1 kHz duty cycle, in a circuit like the one below except some changes:
STM32F103C8T6 ...
- 14k
1
vote
3
answers
2k
views
How to calculate Junction to Ambient temperature of LED?
I'm trying to calculate the Junction to Ambient temperature for this Cree LED:
https://www.mouser.ca/datasheet/2/90/ds--XHP502-1093532.pdf
I know how to calculate this:
Junction Temp = Junction to ...
- 15
0
votes
4
answers
583
views
Is it possible to use a heatsink without a peltier plate?
At the moment I am working on a project which implies LEDs for street lighting. I need to dissipate around 24 W of heat. In order to do so, I calculated how much heat is dissipated into the air, and ...
- 1