Better Quality 50W COB LED? - Page 1
Forum section: electronics / projects

author: BigManBlackT-Shirt
author_rank: Newbie
timestamp: May 19, 2018, 08:39:15 pm
content: I have a 50W COB LED flood light mounted to the outside of my shop as a security floodlight. 2 years ago I had to replace the COB LED because it burned out after 6 months of about 12 hours a day usage.At the time I went ahead and removed the internal LED driver and instead made my own using a Boost converter with adjustable Voltage and Current.I still have to replace a burned out COB LED every 6-8 months and I've decided it;'s because I'm buying the cheap ones off Ebay and Aliexpress. So I now want to spend a bit more money for a name brand to see if they last any longer.Do any of you have experience with a good quality 50W COB LED in the package as seen in this photo? If so, can you tell me where you bought it, model numbers, etc.? I've looked into Cree and Osram and all I can seem to find are the round COB LEDs and my fixture and reflector are for the square ones.Thanks!!

author: viperidae
author_rank: Frequent Contributor
timestamp: May 19, 2018, 11:25:45 pm
content: Are you sure your enclosure is capable of dissipating enough heat to keep the 50W led cool?Maybe you should look at measuring the temperature or running at lower power.

author: texaspyro
author_rank: Super Contributor
timestamp: May 20, 2018, 12:45:34 am
content: Look into Bridgelux LEDs... I've never had one go bad... even those overdriven 100%,

author: BigManBlackT-Shirt
author_rank: Newbie
timestamp: May 20, 2018, 08:07:41 am
content: It's possible the enclosure can't sink that much heat. It came with a 50W COB but that doesn't mean it can actually sink that much. I actually run the 50W COBs at around 37W but they still die.

author: BigManBlackT-Shirt
author_rank: Newbie
timestamp: May 20, 2018, 08:08:12 am
content: Quote from: texaspyro on May 20, 2018, 12:45:34 amWill do, thanks!

author: mikerj
author_rank: Super Contributor
timestamp: May 20, 2018, 09:31:56 am
content: Quote from: BigManBlackT-Shirt on May 20, 2018, 08:07:41 amThen get a thermocouple onto it and measure the temperature rise.

author: wraper
author_rank: Unknown
timestamp: May 20, 2018, 09:39:18 am
content: You should check if there are no faulty LEDs in the module you bought. They can be really crap.

author: BigManBlackT-Shirt
author_rank: Newbie
timestamp: May 20, 2018, 08:20:11 pm
content: Do any of you have experience with a good quality 50W COB LED in the package as seen in this photo? If so, can you tell me where you bought it, model numbers, etc.?

author: madires
author_rank: Super Contributor
timestamp: May 20, 2018, 09:20:49 pm
content: My take on cheap Chinese LEDs is to convert Chinese Watts into SI Watts: P = 1/2 or 1/3 Chinese WattsWorks like a treat in most cases.

author: BigManBlackT-Shirt
author_rank: Newbie
timestamp: May 21, 2018, 04:42:03 am
content: Well I was unable to find a name brand COB LED in the same package as the one in the photo I uploaded in the original post, so I will order the Cree CXA2530 instead. I really like the old, all-in-one package with holder/mount built-in to the LED but apparently these round ones that require separate holders are the trend.

author: BravoV
author_rank: Super Contributor
timestamp: May 21, 2018, 05:52:18 am
content: Quote from: BigManBlackT-Shirt on May 21, 2018, 04:42:03 amIf you like that kind of mount, and yet good quality led, try Yuji Led, this is high quality build COB led and also high CRI (aka near sun light color) led and its damn expensive.$167 for 2 pcs ...->https://store.yujiintl.com/collections/frontpage/products/bc-series-cob-400hsFew reviews ..https://youtu.be/L3LWXznJx_0https://youtu.be/9v48gXbolFU

author: Psi
author_rank: Super Contributor
timestamp: May 21, 2018, 06:56:23 am
content: +1 for yuji LEDsi got 2x 5600k 50W cobs and plan to get 2 more warm white ones so i can have work room control between warm and cool.

author: BigManBlackT-Shirt
author_rank: Newbie
timestamp: May 21, 2018, 03:24:33 pm
content: Can it possibly be that Yuji are the only ones still making COB LEDs in that package?

author: BravoV
author_rank: Super Contributor
timestamp: May 21, 2018, 04:24:31 pm
content: Quote from: BigManBlackT-Shirt on May 21, 2018, 03:24:33 pmThat package type is used by many Chinese cheap crappy led manufacturers as well, the huge different is the LED dies type, those cheap ones probably used random unsorted LED dies, while YUJI used highly binned and probably really good ones.At above bigclivedotcom video, jump to about 3:10 to hear what his comment about YUJI's dies performance, compared to others common cheap ones.Also he has other few videos too exploring this cheap high watt LED in this form factor in the past, he knows what he is talking when it comes to this COB leds.

author: Psi
author_rank: Super Contributor
timestamp: October 17, 2018, 10:39:06 am
content: Quote from: Psi on May 21, 2018, 06:56:23 amSo one of my 50W Yuji LEDs failed. a bond wire exploded.It was about 10 months old and driven at 1.4A of its 1.5A rating.Yuji are couriering me a replacementExcellent customer service!!

author: The Doktor
author_rank: Regular Contributor
timestamp: October 17, 2018, 12:12:18 pm
content: I've got a friend with about 20 of the cheap ebay/amazon 50W floodlights. COBs drop like flies. Lifetime a few days to a few months, seem to last longest if always on. I've been getting him 100W cheapo COBs off ebay as replacements and running them at 50W. It's easy, both COBs are same voltage but 100W is "rated" for twice the current and has twice the LEDs in it. Price is only slightly higher, and so far no failures after about a year. Don't forget the thermal paste!

author: Psi
author_rank: Super Contributor
timestamp: October 25, 2018, 11:21:03 am
content: Well, its been a week and my other 50W Yuji LED died in exactly the same way as the first one.Not sure what's going on.Maybe my MeanWell psu is putting out spikes, or maybe the batch just had weak bond wires. Im not sure.I don't think i will ask Yuji for another replacement. Seems kinda unfair for them to pay for shipping twice.