Luxeon 5W

[GregS]

Anyone have the max voltage and current to equal 5 watts
into these Led's. The max spec have found is only about 2 watts.
LXHL-PMZ2 etc.


greg

 

[John_H]

Anyone have the max voltage and current to equal 5 watts
into these Led's. The max spec have found is only about 2 watts.
LXHL-PMZ2 etc.


greg

From the data sheet, 700 mA at 6.84V typical is 4.788W typical.

Is the 2 watt number the output? 100W light bulbs are rated byt the power
they consume, not the visible light they radiate.

 

[GregS]

From the data sheet, 700 mA at 6.84V typical is 4.788W typical.

Is the 2 watt number the output? 100W light bulbs are rated byt the power
they consume, not the visible light they radiate.

I was looking at another electrical drive sheet, and it said 350 ma.@ 6 volts.
Thats input power. The 5W led is four times as bright as the 1W series.

greg

 

[GregS]

I was looking at another electrical drive sheet, and it said 350 ma.@ 6 volts.
Thats input power. The 5W led is four times as bright as the 1W series.

I have some work to do to find the best way to sink these things, as I need
to get 9 LED's in very close proximity. I'm thinking copper with a 100um
layer of insulation. Some kind of epoxy painy? I'm also considering
glueing the LED emitters directly to copper rods which will
terminate into another block of copper or aluminum.

greg

 

[Don Foreman]

Anyone have the max voltage and current to equal 5 watts
into these Led's. The max spec have found is only about 2 watts.
LXHL-PMZ2 etc.


greg

That partnumber isn't on my datasheet. Many of the 5-watt Luxeons
have typical Vf of 6.82v at rated 700 mA and 25C, which is 4.48 watts.

 

[Don Foreman]

I have some work to do to find the best way to sink these things, as I need
to get 9 LED's in very close proximity. I'm thinking copper with a 100um
layer of insulation. Some kind of epoxy painy? I'm also considering
glueing the LED emitters directly to copper rods which will
terminate into another block of copper or aluminum.

greg

If you use Stars, the heatsink is electrically neutral so they can go
directly on the heatsink. Use heatsink grease. With emitters,
secure them with a good thermal epoxy like Omegabond 101. In either
case, your heatsink is going to need enough area or forced air cooling
or both to keep the sink at acceptable temperature while dissipating
45 watts or so. Check their website for app notes on thermal
management and maximum acceptable package operating temperatures.

 

[[email protected]]

I was looking at another electrical drive sheet, and it said 350 ma.@ 6 volts.
Thats input power. The 5W led is four times as bright as the 1W series.

greg

AB23: Thermal Design Considerations for Luxeon V Power Light Sources
(http://www.lumileds.com/pdfs/protected/AB23.PDF)

The Luxeon V takes 700mA drive @ roughly 7V, as John_H commented
above.

FYI, the early white Luxeon V--now called the Luxeon V Portable-- was
only rated for 500hrs operation rather than 100,000hrs. I don't know
if this has changed.

James Arthur

 

[GregS]

If you use Stars, the heatsink is electrically neutral so they can go
directly on the heatsink. Use heatsink grease. With emitters,
secure them with a good thermal epoxy like Omegabond 101. In either
case, your heatsink is going to need enough area or forced air cooling
or both to keep the sink at acceptable temperature while dissipating
45 watts or so. Check their website for app notes on thermal
management and maximum acceptable package operating temperatures.

The emitter heat surface is electrically active, so each emitter
must be isolated from each other.

greg

 

[John_H]

I have some work to do to find the best way to sink these things, as I
need
to get 9 LED's in very close proximity. I'm thinking copper with a 100um
layer of insulation. Some kind of epoxy painy? I'm also considering
glueing the LED emitters directly to copper rods which will
terminate into another block of copper or aluminum.

greg

I'm more interested in the use of heat spreaders such as:
http://www.graftechaet.com/egraf/products.asp?id=1
Which provide the opportunity to move the heat to a larger heatsink area
around the LEDs.