Cheap and Cheerful DIY using Citizen cobs

[CobKits]

Theyve seen my site and have given me no restrictions so far. i talk to them a few times a week

 

[voon]

that it was the discretion of individual retailers .. maintain their own pricing policy of these chips in its own market?

 

[BuscaLuz]

687/.56 = 1227 PPFD

Didn't @Zulunature actually do this conversion?

I saw conversions from a few different models, but none for the marsII 900W 5w chips.
Growmau5 (youtuber) was the one that inspire me.

Why not just order from US sellers? Actually @BOBBY_G are you sure Citizen is ok with you reselling their cobs? They seem to restrict sales to official distributors and they are only able to ship to certain countries. Like CDI and tme.

I am in the UK, and the idea it was to do it asap, as I need the light back on place. That's mainly why I am looking at Europe sellers (for the fast delivery), but if the price is worth it I don't mind to wait a little for them.
If someone know where I can find a decent price on them, please let me know!!
Also I am not sure if the customs will make me pay tax? As the amount of money is not small!

 

[kelly1376]

Great thread here. Curious if anyone has built 4 CLUO58-1825 in series? What kinda holders/heatsinks would be compatible with that, running at 1050?

 

[CobKits]

no holders "rated" for 058 in series tho people swear BJBs are fine

 

[CobKits]

1825 at 1050 mA are a very efficient 50W and any pinfin heatsink 100mm and up is adequate

 

[Ryante55]

Has anyone tried out the clu731-1210?

 

[CobKits]

Has anyone tried out the clu731-1210?

looks like the clu048-1212 has 20% efficiency on it. not sure what the use would be unless you were building a flashlight and needed a tiny LES

 

[Ryante55]

looks like the clu048-1212 has 20% efficiency on it. not sure what the use would be unless you were building a flashlight and needed a tiny LES

I was curious what lower current efficiency would be for the clu731 the data sheet I saw had it at 1750ma I think compared to 1000 for the clu48 sheet

 

[Ryante55]

Also maybe better light penetration?

 

[JorgeGonzales]

Has anyone tried out the clu731-1210?

Why? We don't need a smaller LES or the tradeoffs that entails.

It's the exact same shit as a CLU038-1210, with a higher nominal current.

 

[CobKits]

Also maybe better light penetration?

does not compute. less lumens per LES at a given wattage and distance cannot possibly "penetrate" more

 

[Ryante55]

Why? We don't need a smaller LES or the tradeoffs that entails.

It's the exact same shit as a CLU038-1210, with a higher nominal current.

Oh the data sheet I saw tested the 38 at 900 ma whats the efficiency of the 731 at 900?

 

[Ryante55]

does not compute. less lumens per LES at a given wattage and distance cannot possibly "penetrate" more

I guess I'm just stoned I was thinking the more narrow beam would make it penetrate more

 

[CobKits]

its not more narrow, just smaller. in absence of optics all chips have similar radiation patterns if you look at the polar graphs on the datasheets

 

[JorgeGonzales]

Oh the data sheet I saw tested the 38 at 900 ma whats the efficiency of the 731 at 900?

The. Same.

 

[PurpleBuz]

hey bobby, @CobKits

I have a need for smaller LES cobs and was wondering how the 14.5mm citizens stack up against the nichia 14.5mm chips.
Seeing as your working closely with citizen, I'd be happy to put in orders with you if the citizen cobs perform as well as as the nichias.

 

[Ryante55]

The. Same.

Efficiency doesn't improve at all when you lower the current? Sorry I'm trying to understand the data sheets better now I'm totally lost

 

[JorgeGonzales]

Efficiency doesn't improve at all when you lower the current? Sorry I'm trying to understand the data sheets better now I'm totally lost

The same as the 38.

 

[Ryante55]

The same as the 38.

Oh ok so about 140lpw for the 3500k