Power driver for Ultra Power LED from Bridgelux BXRA-C4500

[nedstar]

KJ6EAD, take a look below the data,

Cool White BXRA-C4500

Lum-Flux (Tcase=60c) = 3150 Lum-Flux (Tcase=60c) = 3500 Fw Volt 24.6 Fw mA 1400
Lum-Flux (Tcase=60c) = 3800 Lum-Flux (Tcase=60c) = 4250 Fw Volt 25.1 Fw mA 1750
Lum-Flux (Tcase=60c) = 4500 Lum-Flux (Tcase=60c) = 5000 Fw Volt 25.4 Fw mA 2100 [1]

1. Product is tested and binned at the specified drive current.

Voltage = Min 23.4v Typ 25.4v Max 27.4v
With my SMPS + 10% = 26.4 Volt I stay in a very good range
Just between Typ and Max.

The SMPS device has an output of 24 +/- 10% volt and 2.5 Amp,
With this I get my 26.4 Volt and 2.1A and 4500+ lumen

---------- Post added at 10:58 ---------- Previous post was at 09:51 ----------

Just received the SMPS in my office so tonight can try it.
Looks good, compact and small 100x35x80mm.
I also order 5 more Cree MX3SWT-A1-0000-000AE7 LED, WARM WHITE, 87.4lm
but it was not in stock, it has to come from USA so have to wait maybe until tomorrow.
I still have 4 pieces, they are very small and I use this to fit in very small light bulbs so the heatsink is a little challenge.

 

[nedstar]

Here you find a simple design of a led driver for input 85 - 265 vac and output 12vdc 350mA 4.2 Watt
size is very small 23x43mm pcb.
http://www.powerint.com/sites/default/files/PDFFiles/der186.pdf

 

[KJ6EAD]

The data you cite:

Lum-Flux (Tcase=60c) = 3150 Lum-Flux (Tcase=60c) = 3500 Fw Volt 24.6 Fw mA 1400
Lum-Flux (Tcase=60c) = 3800 Lum-Flux (Tcase=60c) = 4250 Fw Volt 25.1 Fw mA 1750
Lum-Flux (Tcase=60c) = 4500 Lum-Flux (Tcase=60c) = 5000 Fw Volt 25.4 Fw mA 2100

is erroneous and doesn't match the Bridgelux data sheet, specifically Table 6 on page 10. Is it a transcription error from a catalog page perhaps?

By using a voltage regulated supply where a current regulated supply is called for, you will either shorten the life of the LED array or fail to achieve maximum rated luminous output. This is mainly because of temperature variation but will also be affected some by product aging. You should be prepared to readjust the voltage or series resistor from their initial settings.

 

[nedstar]

This data is from the original Bridgelux and is Table 6 on page 10, yes I have to use a resitor to reduce the current and a heatsink with fan.

 

[nedstar]

Last night I test the SMPS of Farnell, I can adjust the voltage +/- 25%.
I adjust it to 24.6v over the led and without resistor it gives a very stable output current of 2.07 mA and that's exacly what I need.
The heatsink I use from an old computer proc. with little fan, size 50x50x25mm but it's just a little to small so today I will extend it with 2 alum strips.
Very important is to have a good heatsink because it will keep a good balance between voltage an current.
Will keep you inform about the test.