Safe current for XML2 on Aluminum MCPCB

[clemence]

@WalkIntoTheLight

Okay, I did a quick test of my most-used FET light, the Astrolux C8. I’ve had it for about 1.5 years, and put on about 15-20 hours of “full output” usage on it (just a rough estimate). It does have a timed step-down, but I always bump it back up every time it steps down. So, it does get hot, though not too hot to hold.

The output is exactly what I tested on it when it was new, a little under 1300 lumens. No current measurements, though.

Okay, I know you say you can’t tell with FET lights, but if the damage is so quick, it’s got to show up as decreased lumen levels eventually. Unless the damage stops after a certain point, and lumen and current levels stabilize.

Is the damage you’re seeing, possibly due to improper heat-sinking?

Please check if you think my setup wasn’t cool the LED enough:

Nichia NF2W757GR-V3 [GRV3]

Nichia sent me hundreds of several different LED types for my past city garden light project prototyping. I found some very interesting “BLF-worthy” LEDs. One of them is currently the only medium power Nichia LED which is OEM rated up to 2,4 watt/LED. For 3030 medium power LED, it’s like an XHP50 to XML. It’s Nichia’s most powerful medium power LED. There are two variants available: NF2W757G-V3 (3V) and NF2W757GR-V3 (6V) I’m only interested in NF2W757G*R*-V3 (GRV3) because it’s OEM rated up to …

First look at Nichia 119D D340 sm505 R70

Received the engineering sample from Nichia today. I requested the 119D instead of 219D because I’m still curious and optimistic that 119 footprint will outperforms 219 on my VR16S1 board as I suspected months ago. The larger total cooling area plus larger current capability with 119 footprint should nett higher max output than the less than optimal 219 thermal pad surface. This 119D also very interesting with it’s “glass lens” as described in the data sheet. Let’s find out if this new LED has …

[Clemence]