[PSUBS-MAILIST] LED maximum forward voltage

[Alan via Personal_Submersibles]

Cliff,
below is the reply from Kevin. In the past he has asked questions from
engineers for me, but is just quoting a data sheet here. I know that their
test criteria for maximum temperature is well above their recommended
temperature & they test for something like 1000 hrs. 
These are designed to be run in buildings continuously so I don't think
a small over voltage for a short time in our application is going to be harmful.
Might see if I can extract a bit more from him.
Alan


Sent from my iPad

> On 29/08/2017, at 2:15 PM, Kevin SG <kevin at tyf-led.com> wrote:
> 
> Hello Alan,
>  
> Hope everything goes well.\
>  
> I get the information from the website what you share, and it is Bridgelux COB modular, There are more details in datasheet. i found the information as following, hope can help you a lot.
> <10150101293.jpg>
> Led Modular max Voltage can be 40.9 if Current is 2100mA.
>  
> if voltage is low, the led can not be light up, if voltage is high, the brightness will be high, but if >40.9(max Voltage), LED easy to be damaged.
>  
> More details, find the attached file please.
>  
> Best Regards
> Kevin
> Sales Engineer
> 
> Shenzhen TongYiFang Opto-electronic Technology Co., Ltd.
> <10150102152.bmp>
> Headquaters: Building 1 and 3, Xinlianhe Industrial Park, No.3 Jincheng Road, Shajing Town, Bao'an District, Shenzhen, 518104 China.  
> Mobile: +86-13286655146
> Whats App: +86-13286655146   
> Skype: tyfkevin 
> Website: www.tyf-led.com  
>  
> --------------- Original Message ----------
> From: Alan <alanlindsayjames at yahoo.com>;
> To: <kevin at tyf-led.com>;
> Sent: 2017-08-29 08:11
> Subject: LED maximum forward voltage
> 
> Hi Kevin,
> hope you are keeping well.
> My lights are looking great & have had a custom driver made for them.
>    I have a fellow submarine builder who is developing an open source 
> submersible light using this item...
> https://www.digikey.com/product-detail/en/bridgelux/BXRC-50C10K0-L-24/976-1277-ND/5180249
> We are generally operating off a 36V battery pack. This voltage can vary to more than 40V depending on the state of charge. We cannot see any maximum forward voltage
> rating for this LED.
> Can you advise of the maximum forward voltage & also will it tolerate 2100ma at
> 40V. Any advice on the adverse effects of running the voltage too
> high would be appreciated. 
> Kind regards 
> Alan
> 
> 
> Sent from my iPad
> <DS33 Vero 29 Array Data Sheet Rev L 20160606.pdf>
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