Spectral lightmeter Gigahertz-Optik MSC15

[JorgeGonzales]

Does your meter adjust for spectrum? Seems like the 3500k should be a bit more higher than the 2700k. Or is the clu058 just that good?

It's actually even better than it looks, see the pie chart somewhere up there ^. The CLU058 is throwing off about 7% into far red above 700nm. You can see on the actual SPD charts @Malocan measured as well. Pretty cool.

 

[JorgeGonzales]

@Malocan you went with the precision resistor version? That's a clever solution from a clever guy. Much less ghetto than matching with the wall meter.

 

[BOBBY_G]

Does your meter adjust for spectrum? Seems like the 3500k should be a bit more higher than the 2700k. Or is the clu058 just that good?

in 3000K 80 cri the 1825 beats the 3590 by about 5% so i would expect the 2700k 80 cri to about match this

2700 90 cri matching a 3500k 80cri at 50W is impressive indeed

 

[HydrOGdeluxe]

Isn't that particular 1825 2700k 90 cri also $20 more expensive than a cxb3590?

 

[JorgeGonzales]

Isn't that particular 1825 2700k 90 cri also $20 more expensive than a cxb3590?

They are ~$40.

 

[HydrOGdeluxe]

They are ~$40.

Can you post the specific part number please? I just looked at one at cdiweb at $59 and $79 at digi.

Edit, Nevermind, found it, was looking at 3618...

 

[JorgeGonzales]

in 3000K 80 cri the 1825 beats the 3590 by about 5% so i would expect the 2700k 80 cri to about match this

2700 90 cri matching a 3500k 80cri at 50W is impressive indeed

It makes me happy to see a 2700k 90 CRI beating the 3500k 80 CRI @ 50W. That's by far the most popular combo of temp, CRI and wattage on this site. Not too shabby.

 

[JorgeGonzales]

Can you post the specific part number please? I just looked at one at cdiweb at $59 and $79 at digi.

https://northerngrowlights.com/collections/all/products/citizen-clu058-cob?variant=21331144260

90 CRI versions don't cost any more from Citizen, unlike Cree. And our friend @BOBBY_G here took a chance and ordered some to stock for DIYers. I suspect they will sell out quickly.

 

[HydrOGdeluxe]

Thanks, I somehow ended up looking at 3618 page. But found it now at cdi too, at $42
https://led.cdiweb.com/ProductDetail/CLU0581825C4273H5K2-Citizen-Electronics-Co-Ltd/590999/

And thank you too Malocan, for sharing the data.

 

[BOBBY_G]

https://northerngrowlights.com/collections/all/products/citizen-clu058-cob?variant=21331144260

90 CRI versions don't cost any more from Citizen, unlike Cree. And our friend @BOBBY_G here took a chance and ordered some to stock for DIYers. I suspect they will sell out quickly.

im gonna go out on a limb and say that 90 cri versions from cree wouldnt cost more from cree but vendors get better breaks at qty which is why 3500k 80 cri 36V are the cheapest cxb3590s around. i may be wrong (i dont work with cree, only resellers)

i ordered the most of
3500k 80 cri
3500k 90 cri
3000k 80 cri

and only have 20-30 each of
3000k 90 cri
2700k 90 cri
2700k 80 cri

all 1212 and 1825

1818s on order but several weeks out

i have my own ~1800W build and at least 6000W of builds im doing for friends (so far) so not sure how much ill have left for DIYers. lead time is so long with citi its a guess as to what people would want 8 weeks from now. i have a feeling once my colorado friends show off their rigs ill be building some more

 

[guod]

@Malocan you went with the precision resistor version? That's a clever solution from a clever guy. Much less ghetto than matching with the wall meter.

1% from the Picture

 

[salmonetin]

...5 band resistor....from the picture... guod you saw brown line?... wow

...bendita vista... o buena lupa de aumento...



Saludos

 

[guod]

bendita vista... o buena lupa de aumento

workstation...photoshop... high res. monitor

 

[Malocan]

@Malocan you went with the precision resistor version? That's a clever solution from a clever guy. Much less ghetto than matching with the wall meter.

http://www.reichelt.de/0-6W-1-10-0-Ohm-97-6-Ohm/METALL-10-0/3/index.html?&ACTION=3&LA=2&ARTICLE=11448&GROUPID=3076&artnr=METALL+10,0
its has 1% tolerance, the 0,1%was out of stock. Would take to much time to wait for them

The 0,1% version i did order too, i will use them for future measurements. First they need to come

 

[robincnn]

estimated Beam-angle(50% FHWM ) for the CLU058 is less then 100°.

Wouldn't we expect that to be 120 degrees for both cobs? Those numbers look a little...slanted, like the cob was tilting down and to the left viewed from above.

Polar Radiation Pattern
In this chart it looks like both 1825 and Vero 29 have 50% FHWM close to 90°.

Spatial Radiation Pattern
In this chart below from Vero 29 it seems 50% FHWM close to 120°. Citizen does not provide this chart

Cree datasheet looks like 115°.


I think all cobs have very similar radiation pattern. 50% FHWM close to 120°.
COB holders may change it.

 

[JorgeGonzales]

...5 band resistor....from the picture... guod you saw brown line?... wow

...bendita vista... o buena lupa de aumento...



Saludos

Looking at the first picture I couldn't even count bands, let alone see colors. The other three are way sharper.

Zoom....enhance!



Derp.

 

[JorgeGonzales]

I think all cobs have very similar radiation pattern. 50% FHWM close to 120°.
COB holders may change it.

Thanks, robin...but not according to the data sheets? And does the Vero 29 contradict itself? I saw the same 90 degree spread in polar chart for the 1825, and @guod seemed to confirm less than 100.

@Malocan, did give you his beam angle calculation spreadsheet? Does the CXB3590 match the 1825, give or take?

Testing cobs at a fixed distance across manufacturers depends on identical spread at the sensor, or it's all out the window. That's why I keep bringing it up.

 

[guod]

Polar Radiation Pattern
In this chart it looks like both 1825 and Vero 29 have 50% FHWM close to 90°.

with polar patterns you think in circles...

 

[JorgeGonzales]

with polar patterns you think in circles...
View attachment 3733786

Oh fuck. Wish I could like that twice. Big red line fooled the hell out of me.

Edit: no, seriously. I've built (crappy) antennas and use microphones for a living, and yet my brain just said "follow the big red line". My mind is blown.

 

[robincnn]

@guod thanks for correcting me on the polar chart.

120 for 1825 as well.