Bridgelux EB Gen 2 safe temperature

[stefunk]

Hello everyone,

I've built lamp, based on many threads on that forum, but I have some concerns regarding heat.

My setup contains:

2x BXEB-L0560Z-50E2000
4x BXEB-L0560Z-30E2000
4x BXEB-L0560Z-35E2000

(specs - https://www.digikey.pl/pl/htmldatasheets/production/2520979/0/0/1/eb-series-gen-2.html?site=PL&lang=pl )

Everything is powered by HLG-185H-48A running 41.3V, leds are connect by 2.

Leds are attached to 2mm aluminum plate 60x40cm with 3m heat transfer tape

While runing it on full power, (194W) Im getting 56 celcius on led strip (measured with pyrometer on led), Im wondering what is safe temperature here, and if I should think about heat sinks or active cooling. Or it makes no sense to squeeze more from them, and I should limit power and run them max at ie 40 celcius?

 

[Rocket Soul]

They will last much longer under 50C, but this being a somewhat cheapo build id happily take 56C as well, if something breaks just a few bucks to replace.

 

[PSUAGRO.]

120mm -150mm computer fan is cheap way too actively cool the strips if you want to? 56c is high for a winter run? Summer ambient temps may cause issues. Heat is #1 enemy for electronics obviously....

Check the spec sheet to be sure , link doesn't work for me.

 

[stefunk]

They will last much longer under 50C, but this being a somewhat cheapo build id happily take 56C as well, if something breaks just a few bucks to replace.

Exactly that my point, it's 5 bucks / strip

120mm -150mm computer fan is cheap way too actively cool the strips if you want to? 56c is high for a winter run? Summer ambient temps may cause issues. Heat is #1 enemy for electronics obviously....

Check the spec sheet to be sure , link doesn't work for me.

I had a look on those fans already but i have no idea how to mount them on flat aluminium, and how they should work. blowing from top to plate would just bring back hot air, and blowing from below would only make grow area smaller. Do you have any examples?

Documentation - https://www.bridgelux.com/sites/default/files/resource_media/DS131 Bridgelux EB Series Gen2 Data Sheet 20171020 Rev A.pdf

That link should work

In specs they stating that max operating temperature is 85

 

[PSUAGRO.]

I mean it's a open fixture design, don't think it really matters other than having good air circulation around the strips? I've given bad thermodynamic advice before, lol..... So do your own tests with a meter.

Blowing across the bars maybe? Good luck

 

[Chip Green]

I have still, to this day, yet to lose a single diode, on any BXEB strip. Some of the fixtures without heatsinks, have been running in perpetuity since 2017.

 

[crimsonecho]

these heat transfer tapes, are they really more or as effective as heat transfer compounds. i looked at a couple of those products but their thermal performances seemed nowhere close to the stuff made for computer parts like cpus. so i went with those for my cobs and attached the cheapest pc fan i could find behind each cob. running very smooth now, the heatsink is barely a couple of degrees hotter than room temp, slightly warm to the touch.
also you may not lose the strips from a little heat instantly but the longer you run them hotter the less light they will produce and it’ll get worse and worse.

 

[stefunk]

I have still, to this day, yet to lose a single diode, on any BXEB strip. Some of the fixtures without heatsinks, have been running in perpetuity since 2017.

I dont have problem running strips with 700mA, question is about going higher than that, what power you're running yours?

 

[Chip Green]

I dont have problem running strips with 700mA, question is about going higher than that, what power you're running yours?

Most of the bare naked strips are at 700ma, but one unit at is at 1050ma.