[GB ended,discussion only] CRI > 80+ NICHIA 2000K-6500K [E21A/219B/219C/319A/144A/757GT-F1(Optisolis)]

Quiz of the day. No, they’re not the same. Find the difference :wink:

- Clemence

The yellow dot on 119D is yellower? Different colour temperature? (Though exactly the same performance indicates otherwise)

Looked at the datasheet. Different soldering pad.

Narrower half-illumination angle (and a little bit more height), if I remember well (i.e. probably good for throwers).

G _ _ _ _ L _ _ _

Good_Luck?

:laughing: nope

Anyone are welcome to try the quiz EXCEPT Djozz and Zak

BTW, I already mentioned different soldering pad. I suppose there’s another difference? Or maybe this one, but you worded it differently?

No, the 119D and 119C have the same foot print. This is another obvious difference

G L A S S L E N S

I’m really hoping that this is not another typo. If this is the case then dedoming this LED would be the easiest and cleanest dedoming job with less lumen loss as usual. The idea of using multi refractive index material was introduced three years ago by a chinese scientist. He demonstrated more than 21% output using the same die. He used 5 layers silicone from the high to low to slowly reduce the RI transition to extract more photons off the die.

- Clemence

You mean the difference between 119C and 119D? I haven’t seen that comparison in the posts above (or 119C being mentioned at all).

I thought the question was what’s new in 119D/219D over 119C/219C. But yes, 119 package is better thermally compared to 219 package on two pads board like my VR16S1. Larger thermal pad area
And probably somewhat higher current handling too

- Clemence

We’ve had a bit of confusion. :slight_smile:

But yes, your find is very interesting.

I could be wrong. If the configuration is like this: die - glass - phosphors embedded silicone, then its a total disaster. Dedoming would remove most all of the phosphor and leave us a big royal blue LED!

- Clemence

I’m surprised that 119 without dedicated thermal pad is better than 219…

You can use the webplotdigitizer to check the total surface area between 119 and 219 package. But high performance non DTP MCPCB or non isolated MCPCB must be used.

- Clemence

Another improvement in 119/219D is its thermally more stable. From –30C to 25C the output remains almost the same. Less output reduction in higher temperature too.

- Clemence