Cheap chinese 20W LED that is actually good. - Page 1
Forum section: electronics / general

author: Refrigerator
author_rank: Super Contributor
timestamp: October 19, 2016, 11:54:29 am
content: A while ago i was looking for a 20W warm white LED and spotted some that looked a bit different than others.http://www.ebay.com/itm/321875269086?_trksid=p2057872.m2749.l2648&var=510820545744&ssPageName=STRK%3AMEBIDX%3AITToday the led arrived.And here it's running >1mA.Looks like it's illuminating perfectly evenly, i'll be ordering more to see if they're all this good.

author: ez24
author_rank: Super Contributor
timestamp: October 20, 2016, 01:24:44 am
content: ThanksWhat country eBay is this?I think there is an interest in Chinese components, especially good ones.

author: CJay
author_rank: Super Contributor
timestamp: October 20, 2016, 12:51:39 pm
content: Looks good.Tried to order a few, oh..."Shipping and handlingItem location: GD, ChinaShipping to: WorldwideExcludes: France, Germany, United Kingdom, Australia, United StatesQuantity:Change country:This item does not ship to United Kingdom "

author: Refrigerator
author_rank: Super Contributor
timestamp: October 20, 2016, 01:39:39 pm
content: Quote from: CJay on October 20, 2016, 12:51:39 pmI wonder why they have all these countries excluded.You could try looking for other sellers that might have this style of LED, but no guarantees if they're the same quality.

author: CJay
author_rank: Super Contributor
timestamp: October 20, 2016, 06:02:46 pm
content: Quote from: Refrigerator on October 20, 2016, 01:39:39 pmOdd that they do but at least I can try and find something similar and take a gamble on the quality being as good and consistent.

author: TopLoser
author_rank: Unknown
timestamp: October 20, 2016, 06:15:01 pm
content: Quote from: CJay on October 20, 2016, 12:51:39 pmhttp://www.ebay.com/itm/321705997340Same seller, same item, same price, but ships worldwide.

author: metrologist
author_rank: Super Contributor
timestamp: October 20, 2016, 07:51:24 pm
content: Could I get 5 of these and a diode all in series, and then connect that straight to my 120V mains? Which diode would I need? Would I also need a current limiting resistor?

author: kripton2035
author_rank: Super Contributor
timestamp: October 20, 2016, 09:12:19 pm
content: Quote from: TopLoser on October 20, 2016, 06:15:01 pmwell ... they ship to europe, but exclude france, germany, and Switzerland among many others ... why ?

author: Kilrah
author_rank: Unknown
timestamp: October 20, 2016, 09:25:34 pm
content: They probably had issues with customs from these countries...

author: TerraHertz
author_rank: Super Contributor
timestamp: October 20, 2016, 10:42:35 pm
content: Quote from: TopLoser on October 20, 2016, 06:15:01 pmhttp://www.ebay.com.au/itm/LED-SMD-Chip-Bulb-10W-20W-30W-50W-100W-Super-Bright-High-Power-For-Floodlight-/131884355495Same heading and pic, in ebay Australia.Maybe they are selling via local sales agents, hence the country restrictions? Or something to do with optimizing their postage cost vs item cost?Incidentally, beware those 50W red LEDs. They are actually blue LED chips with red phosphor cover, and it doesn't work very well. See my experience here:http://everist.org/NobLog/20150628_LED_lighting_mk3.htmOtoh, the 10W range of colored LEDs actually have the right color LED chips, with clear cover material. Only white uses a phosphor.

author: Refrigerator
author_rank: Super Contributor
timestamp: October 21, 2016, 04:47:04 am
content: Quote from: metrologist on October 20, 2016, 07:51:24 pmDirectly connecting the LEDs to mains is a very bad idea, even with a diode for rectification you would never achieve constant current, which is needed to properly drive the LED.LED power supplies are there for a reason.

author: bktemp
author_rank: Super Contributor
timestamp: October 21, 2016, 05:19:19 am
content: Quote from: kripton2035 on October 20, 2016, 09:12:19 pmThere is some European law prohibiting the import of dangerous prducts (for example products without a CE marking). And because there are some dangerous LED lamps, they don't allow you to import anything with LED as the main component from China.That started somewhere in 2015. Therefore most Chinese sellers now have stopped selling LEDs to Germany, because German customs follows the regulations a bit more strictly than other European countries.