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Old 02-04-2013, 07:51 PM #33
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

Mouser's price isn't horrible either. Probably cheaper per lumen than XMLs from China, even though they're a bit more per emitter.

I think a hexagon will be the shape. Rows of:
4
5
6
7
8
7
6
5
4

Except that the center row of 8 will be missing its center 2 emitters, and the adjacent rows of 7 will be missing their center emitter. Makes for 48 emitters, which is easily divisible into different configurations depending on driver solution.


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Old 02-04-2013, 11:36 PM #34
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

Rhd, ill give you an idea I have been saving to use sometime for a high power laser.

Drill a bunch of holes through the heatsink and hook little hose to it going to a small pump in the pill. The radiator will be thin copper tube wrapped around the handle. Run mineral oil through it and it should be able to radiate a lot of heat.

Heres the pump:
http://www.dx.com/p/diy-micro-liquid...20002&u=163258
Or
High temperature(100'C) 1L/Min (15GPH) mini DC6V Water Pump. Food grade. Sous Vide:Amazon:Industrial & Scientific
And the copper tube:
Refrigeration Copper Tubing, 1/8" x 50':Amazon:Home Improvement

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Old 02-08-2013, 03:02 PM #35
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

That would be very cool!

Although I've already abandoned the thought of making this flashlight cylindrical. At 48 emitters, I think it is going to be a cubic-rectangle box. Still (hopefully) single-handed.

With 21mm reflectors/lenses, the emitting surface needs to be ~16 cm across. I'm thinking that a heatsink on the back of the emitting surface, with dual fans, on on either side, forcing air through the heatsink constantly.
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Old 02-14-2013, 08:28 PM #36
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

I'm just glad we're no longer talking about those large, Chinese arrays. Basically they are just stamped boards of 1watt SEMI Led's. Efficiency is horrendous, especially in warmer colors. Maybe like 65watts per lumen at 3500k. The big arrays have problems with heat management as well requiring very think heat sinks to 'wick' it away fast enough.

Bridgelux arrays are far more efficient and actually have lower lumen per dollar costs than the Chinese junk, but optical choices are limited to a few reflectors, and forward voltage is high. Then again they are designed for interiour lighting, not flashlights. XMLs are certainly friendly for battery applications because of their high current / low Vf ratios, and more optical choices.
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Old 02-16-2013, 04:04 AM #37
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

Quote:
Originally Posted by blasterman View Post
Maybe like 65watts per lumen at 3500k.
Not sure if backwards by accident, or making a joke.
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Old 02-16-2013, 01:26 PM #38
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

Check meanwell psus out, some are very high voltage but XMLs are a better choice, 40k lumens of them kicks ass like you wouldn't believe..

Could get the cutter 16 XML boards to save time.

And high voltage dc is extremely dangerous, it will pin you to the conductors involuntarily via muscles, if you mess up bad enough.
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Old 02-16-2013, 05:01 PM #39
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

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Not sure if backwards by accident, or making a joke.
Yep. I was worried nobody would 'get it'.

My favorite ones are the arrays rated for 'volts out-put'.
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Old 03-02-2013, 11:16 AM #40
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

benmwv ,only MCPCB for LT.
LT @ 7A configuration is not the best, an example in 2576 (configured as voltage source) Achieve up to 8 Amps from a LM2575

Why not use CCS (constant current source) with 3 transistors? Regular drop = 1.3 V but can be used with special transistors, in which case the voltage drop is less than 0.5V. Or MOS +comparator (mV, Rs = 0.05),efficiency is high (up to 90%).
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Old 08-15-2013, 06:10 PM #41
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Default Re: Driving a 500W LED Panel - High voltage, constant current, buck, capable of 7A?

I'm actually looking at purchasing one of these beautiful high-power LED lights.

I have read through most of the posts, and found then useful. However, if you look at your LED you'll notice the top and bottom bar connected to the LED four segments. Each segment is connected to a group of LEDs exactly 1/4 of the power is used in each segment. By cutting the bar on top and bottom or one of the other. You can effectively decrease the power required for each driver down to 125 W. the only problem I've found is that this does not lower the voltage required. Most of these 500 W LEDs require at least 80 V.

or a variable power supply which can go up to 100 V 10 amps, costing 300+ dollars. But this would give you a great test power supply for any LED.
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