<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Cliff,</div><div id="AppleMailSignature">below is the reply from Kevin. In the past he has asked questions from</div><div id="AppleMailSignature">engineers for me, but is just quoting a data sheet here. I know that their</div><div id="AppleMailSignature">test criteria for maximum temperature is well above their recommended</div><div id="AppleMailSignature">temperature & they test for something like 1000 hrs. </div><div id="AppleMailSignature">These are designed to be run in buildings continuously so I don't think</div><div id="AppleMailSignature">a small over voltage for a short time in our application is going to be harmful.</div><div id="AppleMailSignature">Might see if I can extract a bit more from him.</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 29/08/2017, at 2:15 PM, Kevin SG <<a href="mailto:kevin@tyf-led.com">kevin@tyf-led.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div>Hello Alan,</div>
<div> </div>
<div>Hope everything goes well.\</div>
<div> </div>
<div>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.</div>
<div><10150101293.jpg></div>
<div><strong>Led Modular max Voltage can be 40.9 if Current is
2100mA.</strong></div>
<div><strong></strong> </div>
<div>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.</div>
<div> </div>
<div>More details, find the attached file please.</div>
<div> </div><span><span id="fttx_sign_begin"></span>
<div>
<div style="TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; FONT: 16px/24px Arial; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-stroke-width: 0px"><font face="Arial">Best Regards</font></div>
<div style="TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; FONT: 16px/24px Arial; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-stroke-width: 0px"><font face="Arial">Kevin</font></div>
<div style="TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; FONT: 16px/24px Arial; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-stroke-width: 0px"><font face="Arial">Sales Engineer</font></div>
<div style="TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; FONT: 16px/24px Arial; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-stroke-width: 0px"><font face="Arial"><br></font></div>
<div style="TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; FONT: 16px/24px Arial; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-stroke-width: 0px"><b><font size="4"><span style="LINE-HEIGHT: normal"><font style="FONT-SIZE: 16px">Shenzhen
TongYiFang Opto-electronic </font></span><span style="LINE-HEIGHT: normal; BACKGROUND-COLOR: window">Technology Co.,
Ltd.</span></font></b></div>
<div style="TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; FONT: 16px/24px Arial; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-stroke-width: 0px"><b><span style="LINE-HEIGHT: normal; BACKGROUND-COLOR: window"><10150102152.bmp></span></b></div>
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</span></font></div>
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tyfkevin </span></font></div>
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<div> </div>
<blockquote style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px">
<div style="FONT: 9pt color=#000000">--------------- Original Message
----------</div>
<div style="FONT: 9pt color=#000000"><b>From: </b><a title="Alan" href="mailto:alanlindsayjames@yahoo.com">Alan
<alanlindsayjames@yahoo.com></a>; </div>
<div style="FONT: 9pt color=#000000"><b>To: </b><a title="href="mailto:kevin@tyf-led.com" ?=""><kevin@tyf-led.com></a>; </div>
<div style="FONT: 9pt color=#000000"><b>Sent: </b>2017-08-29 08:11</div>
<div style="FONT: 9pt color=#000000"><b>Subject: </b>LED maximum forward
voltage</div><br>
<base target="_blank">
<div><span></span></div>
<div>
<div>Hi Kevin,</div>
<div id="AppleMailSignature">hope you are keeping well.</div>
<div id="AppleMailSignature">My lights are looking great & have had a custom
driver made for them.</div>
<div id="AppleMailSignature"> I have a fellow submarine builder who
is developing an open source </div>
<div id="AppleMailSignature">submersible light using this item...</div>
<div id="AppleMailSignature"><a href="https://www.digikey.com/product-detail/en/bridgelux/BXRC-50C10K0-L-24/976-1277-ND/5180249">https://www.digikey.com/product-detail/en/bridgelux/BXRC-50C10K0-L-24/976-1277-ND/5180249</a></div>
<div id="AppleMailSignature">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</div>
<div id="AppleMailSignature">rating for this LED.</div>
<div id="AppleMailSignature">Can you advise of the maximum forward voltage &
also will it tolerate 2100ma at</div>
<div id="AppleMailSignature">40V. Any advice on the adverse effects of running
the voltage too</div>
<div id="AppleMailSignature">high would be appreciated. </div>
<div id="AppleMailSignature">Kind regards </div>
<div id="AppleMailSignature">Alan</div>
<div id="AppleMailSignature"><br><br>Sent from my
iPad</div></div></blockquote></span></div></blockquote><blockquote type="cite"><div><DS33 Vero 29 Array Data Sheet Rev L 20160606.pdf></div></blockquote></body></html>