Led lights

[surfmachine]

Just noticed the original test platform - no fan.

Most high power CPU's have a thermal design property of around 95 + watts.
If you were to run the CPU flat out using a application like "toast" and monitor it with another app like "speedfan" you will see how the temp builds in real time.

Consider the CPU the same as your LED, a heat source.
Run the CPU flat out with the fan and then without the fan and you will see the rapid and concerning temp increase in the second scenario.
My experience here comes from passive cooling experiments in PC's here but is directly relevant to your interest in LED's.
The inference is of course that with a typical 95 - 125 watt CPU cooling fan and heatsink you should be able to effectively cool your 50 Watt LED.

As a design criterion 50 degrees C is fine. Electronics can run hotter but service life falls away after this point.
So that is your engineering challenge to get the size of the cooler you want at the temp you are prepared to run at.

Good luck and enjoy the journey.

surfmachine

[Herbertkabi]

OK,
Waked up early in the morning today and finally started some quick machinings ... took couple of hours and now - here it is - 50W LED lighter with integrated cooler and integrated power supply.
OD 69mm, L-205mm, there is 33V LED-driver inside - thats because its so long, as well as PC cooler and small DC/DC converter for. End cap on the back I will mill out later ... too bored today
Yeah - now it really does not go hot - forepart ca 35C degrees.
I bought special 62mm reflector and lens exact for this LED, via eBay from Taiwan.
Yes, it is bright ... even very bright, but is it better than 50W...60W Halogen or Xenon bulbs? Im not sure. At least there you do not need the cooler and extra driver ... and costs much less.
Looks like I built the most stupid lighter in the world
I have one 30W and few 20W LED but I dont want to build such kind monstrum anymore

[Khalid]

Beautiful craftsmanship on LED light.. Really love the simplicity.

[Herbertkabi]

Yeah, now the end cap is also done,
Lamp has got a little bid scratched but ... ... perhaps sometime later will finish,
At first I need to find where to use such kind of swooshing lighter

For milling machine I need to bethink something smaller, lighter, better,
I hope to use or 20W or 30W LED without radiator and no fan
cheers,
herbert

[gombault]

Hi Herbertkabi,

We made this adjustable lamp using 3 Cree LED’s and optical lenses for a machine tool lamp and it’s super bright. We only run the LED’s 300 m A.
See picture of our DRL’s light output at About Us it’s 4x 1w Cree LED,s with spot light lenses.
Regards
Gombault

[Herbertkabi]

Yeah, nice lamps,
Why I do not see how/where to buy and what is cost of
cheers,
herbert,

In fact my 50W led lamp is inasmuch bright that no way to use as machine tool light if you do not like to wear a sunglasses
the only advisable use is photography or cinematography
Still have 30 watt and 20w ones, will build when sure purpose comes up.
One 20W LED is red - what the hell I need to do with, who has any idea

[mcphill]

If you have a way to do pulse width modulation, you can dim the 50W to whatever you want. You just need to turn if off-on-off-on-... very fast (with a controller). Vary the duration of the on and off times and you can make it as dim as you want, up to full bright.

[Herbertkabi]

If you have a way to do pulse width modulation, you can dim the 50W to whatever you want. You just need to turn if off-on-off-on-... very fast (with a controller). Vary the duration of the on and off times and you can make it as dim as you want, up to full bright.

Yeah?
Thank you very much,
I know what is PWM, but how I can to do like that when I have factory made "current sense" 33V power supply especially for this 50W LED
Perhaps this is just common switch mode ac/dc 33V powers supply, nothing about specific "current senses" inside?
To be honest my 30W and 20W LEDs I have tried with common regulated power supply ... works very well but I was little bid be afraid I will ruin these LEDs but now when to think about and to look at cost of power supplies then ... "special" power supply for LEDs costs twice more than the same parameter common switch mode power supply ... "special" is just business trick?

cheers,
herbert

[gombault]

Hi Herbert,

That machine tool light is a one off I made up from components of our other lights. I am using it on one of my own machines. I was thinking of making it with a magnetic base and rechargeable batteries, a type of mobile machine light. Still deciding on that.

Gombault

[SPEEDRE]

I wanted to build a super bright light that I could use for building models but I never thought about the heat generated by fifty or one hundred LED's. Needing all the cooling stuff sort of defeats the idea of building a super bright LED lamp. Besides I don't know enough about electronics to monkey with it anyways.