Emitter choices, specifically 519a

vicv

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So I see this emitter is all the rage. And seems to look nice in pictures. Especially in 4500k. At this point, my favorite led is the sst-20. 4k. The cri and tint is nice, and it's a small led, so throw is pretty good. I'm seeing in lights with the Nichia though, cd is typically very low compared to other options in the same light. I very much dislike floody lights. It's a waste of lumens and directly related, battery. So is my findings correct? Is this a very floody led? I can always go to a larger head to make up for it if it's worth it for the tint. Thanks
 
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F89

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The 519a could be considered floody, particularly against the SST20.

I've tried the 4500K and it was nice but I still prefer the 219b sw45k.
I dedomed a 4500K and it is more throwy but it's not particularly so. Probably similar to an XPL-Hi in form.
The 4500K comes out fairly warm once dedomed as expected. The 5700K would be the best bet for ~4500K once dedomed.

Nichia tints are usually very good but if you're happy with your SST20 there's probably not a lot to be gained unless you want to experiment.
 

ilikeguns40

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519a 5700k DD is probably one of my favorite LEDs I've ever tried, sw45k is also IMO one of the best. Photo is 519a 5700k DD
IMG_9848.jpeg
 

ilikeguns40

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A lot of factors also determine what type of reflector the LEDs are being installed in. Some reflectors are deep and some are shallow while some are bigger or smaller in diameter
 
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The 519a could be considered floody, particularly against the SST20.

I've tried the 4500K and it was nice but I still prefer the 219b sw45k.
I dedomed a 4500K and it is more throwy but it's not particularly so. Probably similar to an XPL-Hi in form.
The 4500K comes out fairly warm once dedomed as expected. The 5700K would be the best bet for ~4500K once dedomed.

Nichia tints are usually very good but if you're happy with your SST20 there's probably not a lot to be gained unless you want to experiment.
I also like the 219b 4500K for its rosiness. The 519a 4500K just lacks that tint and doesn't really appeal as much to me. A dedomed 4500K or 4000K are my current favorites.

IIRC, dedoming a 519a drops the CCT by about 200-300K, so dedoming a 5700K won't really get it quite to 4500K? However, as seen in Hogo's testing of their batch of supposed 5700Ks, they were actually 5200K with the dome. Removing the dome on those would definitely be the closest to having a final CCT of 4500-4900K.
 

F89

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I'm not sure what the exact temperature of my DD 4500K is, but I'll say ~3300K?
 

F89

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A C8 will work just fine with a 519a.
I like the OP reflector but I've made a few with various LEDs, drivers and both smooth and OP reflectors.
 

vicv

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The 519a could be considered floody, particularly against the SST20.

I've tried the 4500K and it was nice but I still prefer the 219b sw45k.
I dedomed a 4500K and it is more throwy but it's not particularly so. Probably similar to an XPL-Hi in form.
The 4500K comes out fairly warm once dedomed as expected. The 5700K would be the best bet for ~4500K once dedomed.

Nichia tints are usually very good but if you're happy with your SST20 there's probably not a lot to be gained unless you want to experiment.
An xp-l hi would be fine. I'm not looking for a laser. I like a mixed beam but with a good hotspot. Something like more m61t, less M61

I'd think the 519 would be closer to
xm-l/sst40 which are pretty floody. But probably much better in the big C8 reflector
 

F89

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I have an XPL-Hi in a C8, it's still pretty throwy but is a decent balance.

A 519 either stock or DD would work well in a C8.
Dedoming the 519 isn't particularly complicated, otherwise I wouldn't be interested in doing so. They also have a nice glass surface over the die so it's both fairly simple and clean to dedome.
 

vicv

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519a is a 3535 footprint. So, nothing like a SST40 which is a 5050 footprint.
Fair. I thought they looked closer. I think there's more to throw though than die footprint isn't there? An xp-l is on a smaller footprint than an xm-l but have similar beam characteristics do they not?
An sst-20 is also 3535. As is the xp-g
 

KITROBASKIN

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I have a factory C8 with a 519a. It is mounted on my ebike; good throw and good sized hotspot. Highly recommended.

Also have an Emisar D1 with the dedomed 519a 5700K; a favorite for dog walking because of ample throw for our terrain. This one really looks more like <4000K when compared to other known emitters.
 

kerneldrop

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Fair. I thought they looked closer. I think there's more to throw though than die footprint isn't there? An xp-l is on a smaller footprint than an xm-l but have similar beam characteristics do they not?
An sst-20 is also 3535. As is the xp-g

Throw is determined by the LED die size to the reflector size.
Basically the smaller the LED die size and the larger the reflector the tighter the hot spot, thus the further throw.
Said fancier, the LED die size to the parabolic reflector shape.

LED makers do not publish die size. Usually a hobbyist on budget light forum will post measurements.

SST20 is a 3535 foot print, but has a small die size. That is why it throws further than a 219b, 291c, 519a, 351....those are all 3535 foot print but larger die sizes than SST20.

XP-P is a 3535 and has a smaller die size than an SST20....so when all things equal, an XP-P will throw further than an SST20.

Osram W2.1 (NM1) is the king of LED throwers as the die size is the smallest available. it is a 3030 footprint
Osram W2.2 (PM1) is twice the size of W1, but still quite small. it is a 3030 footprint.

Lumens at some point come into play as 2 lumens from W1 will not go very far. So, maybe a 351 throws further at 1,000 lumens than a 100 lumens W2.1 when all other things equal.

I believe this is the king of throw when paired with the Osram W2.1
 
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cave dave

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SST20 is more efficient and brighter too. I like the 519a and am willing to take the brightness and runtime hit, but I wish it had more throw.
 

defloyd77

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SST20 is more efficient and brighter too. I like the 519a and am willing to take the brightness and runtime hit, but I wish it had more throw.

The 519A is brighter and more efficient than the SST20, at least the high CRI variants. I believe they break even when you dedome the 519, but it gains you more throw then the SST20.


I have an Emisar D1 with a dedomed 4500K 519A and a Noctigon KR1 with a 5700K 519A. The reflectors are the same size, but the dedomed emitter creates a much tighter hotspot. My KR1 does have an orange peel reflector whereas my D1 does not, so I'm not sure how much that comes into play.

I'd suggest trying a 5700K 519a. Honestly I think it's something everyone should experience, a cool white high CRI LED with high R9 values. It's a strange experience for sure and if you dislike it, dedome it for one of the most beautiful 4300ish kelvin tints with a good, practical throw.
 

vicv

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The 519A is brighter and more efficient than the SST20, at least the high CRI variants. I believe they break even when you dedome the 519, but it gains you more throw then the SST20.


I have an Emisar D1 with a dedomed 4500K 519A and a Noctigon KR1 with a 5700K 519A. The reflectors are the same size, but the dedomed emitter creates a much tighter hotspot. My KR1 does have an orange peel reflector whereas my D1 does not, so I'm not sure how much that comes into play.

I'd suggest trying a 5700K 519a. Honestly I think it's something everyone should experience, a cool white high CRI LED with high R9 values. It's a strange experience for sure and if you dislike it, dedome it for one of the most beautiful 4300ish kelvin tints with a good, practical throw.
Ya I'm basically down to whether I'll get the 5700k or the 5000k and then dedome. Probably in a convoy m21A. Might as well go 21700 if I'm going to be pulling 6 amp on high. Briefly
 
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