citizen cob led?

anyone using the citizen? specifically this one http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_5/CLU058-1825C4_P3372_1115.pdf


or any from version 5 http://ce.citizen.co.jp/productse/info.php?no=107


it looks like they get really high L/W at a high drive current

Very viable alternatives for Cree CXB.
Puts the temp droop of the Veros to shame, much stabler lumen output at higher temp.
Great efficiency too

Wow! over 120 Lm/W at almost 200W is pretty impressive.

And from what I've seen, they seem pretty affordable. 60$-65$ per unit but at 120V driving them will not be cheap!

Looks like they are Japan made?


Anyone ever tried them out in a grow?

Yomandude!!! said:

Wow! over 120 Lm/W at almost 200W is pretty impressive.
And from what I've seen, they seem pretty affordable. 60$-65$ per unit but at 120V driving them will not be cheap!
Looks like they are Japan made?
Anyone ever tried them out in a grow?

Click to expand...

I think they only started production on their V5 cobs since oktober so it's going to be very hard to find growlogs on it.
The version 4 cobs are also very recent as they were released in april 2015.

The 3500K 80CRI spectrums seems to be very similar to the Vero 4000K except that it has a little less blue.

They're certainly more efficient than Veros and also handle a higher temperature better.

Edit: You can also drive them ultra low
The CLU58 1825 can be driven at 6 watt for 1288 lumen according to the datasheet at 85 degrees.

frica said:

They're certainly more efficient than Veros and also handle a higher temperature better.

Click to expand...

frica said:

Puts the temp droop of the Veros to shame, much stabler lumen output at higher temp.

Click to expand...

Curious why you think citizen handle a higher temperature better than Vero and about temp droop

Also vero datasheet has lower thermal resistance than citizen.

Vero 29 $24, 3590 $42
Citizen 60$-65$ seems too expensive.

robincnn said:

Curious why you think citizen handle a higher temperature better than Vero and about temp droop
View attachment 3624012
Also vero datasheet has lower thermal resistance than citizen.

Vero 29 $24, 3590 $42
Citizen 60$-65$ seems too expensive.

Click to expand...

Ah my fault.
Eyesight failed and didn't notice that in the chart the 85 degrees was about the junction temp while the 25 degrees was the case temp.
In the Vero datasheet charts the 85 and 25 degrees next to each other are both the case temps.

But it does seem that the rel. flux output at 75C is a tiny bit better for the CLU, because it seems like the blue line is a little above the centre of 100-80%. Miniscule difference if there is one though.

About the price
The Citizen COB in OP is a 117 watt cob at "typical" current while the vero 29 is "only" an 80 watt cob at typical current levels and slightly less efficient.
Also the CLU058-1825 is only 49 dollar not 60-65. (39 when you order 9+ on tme)

I found the 3500k 80cri for $45 looks to me like it's a better option than 3590 but driver matching may be more difficult?

I have one of the CLU058-1825. I haven't fired it up yet, I still need a driver. I think I will power it by an HBG240-60. I am pretty sure that there is 2 versions of it, one is 115v and the other is 56v. The 4000k 80cri @4000mA Tc 65c will be 222 watts / 136 lumen per watt with a Tj 96c.

nevergoodenuf said:

I have one of the CLU058-1825. I haven't fired it up yet, I still need a driver. I think I will power it by an HBG240-60. I am pretty sure that there is 2 versions of it, one is 115v and the other is 56v. The 4000k 80cri @4000mA Tc 65c will be 222 watts / 136 lumen per watt with a Tj 96c.

Click to expand...

Yea the 1825 has 18 dies in series and 25 in parallel.
There's also the CLU058-3618 which has 36 in series and 18 in parrelel

The 3618 has a higher maximum input power at 526 watt, the 1825 pulls max 364.6 watt

I have a couple of the CLU058-3618 also. I have only built a light with 2 CLU550 3000K 70cri, but haven't had time to take Lux measurements. I love free stuff. Unfortunately free stuff means I still have to spend more money. So, drivers and heatsinks are on there way.