Building a fixture with 5w Bridgelux 45mil chips.

[lightSeeker]

Hi everyone,

I am going to build an LED fixture consisting of 5w chips.

These 5w chips contain 2x2 45mil diodes.
Each one of these diodes, if packaged individually, are sold as 3w chips because they are rated at 700mA (3.4v X 700 = 2.4w).

In a 5w (2x2) package, they are also rated at 700mA, each chip receiving 350mA and ~7v X 700 = 4.9 watts in total.

I would love to ask those who have experience with these chips :

.. considering I will be well cooling them

1. Are they rated at their peak efficiency?
2. Can I drive them safely at their rated current of 700mA and obtain 4.9 watts?
3. Or would it be better (and drastically increase light output per watt consumed) if I reduced the current to half?

Cheers guys

 

[bluter]

link to the chip ?

i run cob with some cheap 5050 smd chips for supplemental ramp up / down. i actually run my 5050s at the higher end, i do not under drive them like you would a cob.

sorry i am probably not helping....

 

[lightSeeker]

Page Not Found - Aliexpress.com

www.aliexpress.com

Other sellers also sell the product but Hontiey has well binned stuff.

5w - White (any) has 4 x 45 mil Bridgelux chips each rated for 700mA but in a package of 2x2, 350 ea.

Here is the link to the diode used:

https://bridgelux.com/sites/default/files/resource_media/DS-C15_revH%20Product%20Datasheet%20for%20BXCD4545%20Chip.pdf

 

[lightSeeker]

Hey! You must have good ventilation Thanks for stopping by.
I am open for all sorts of LED convo.

I think by the way I will 50% under drive them.

 

[bluter]

i was looking at the same specs. if i'm reading it right everything on the specs is the max. if it helps i run everything at about 75 - 80 % of the driver, under driving the chips by 50% or more.