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

Wow thanks! That’s super useful information!

Clemence, if you have a next order from Nichia, could you ask for some 219D samples? Or did you already have some (can’t remember). I really wonder why the 219D exists while none of the specs are significantly different from the 219C. Or are they simply cheaper?

Already place the sample request but unfortunately it’s 119D. It’s superior for a special application :wink:

- Clemence

Looking at
http://www.nichia.co.jp/en/product/led_product_data.html?type='NVSW219D'
and

they seem exactly the same

BTW, 219D is just as efficient as 219C despite having smaller die.
May be OK for throwers?

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