g******u 发帖数: 3060 | 1 wrong.
White LEDs are made simply by mixing different colors, you can get pretty
much any color temperature now with LEDs.
whitish-blue is a cold color temp, you can get yellowish-white by mixing
multiple different LEDs. |
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y**********s 发帖数: 210 | 2 一般学校毕业,跟前两天那位兄弟一样,主要玩oxide的LED,但尽最大努力也搞了一点
GaN和MOCVD,但发的paper里边还没有GaN。
搞的都是LED,不过只测测发光,功率啥的,真正commercial 的 packaging,测试,
simulation,和产品有关的都没上手过,也没条件。
投了几家行业内的公司Cree,GE,Philips和一些半岛体公司,都没啥回音.
请问还有没有别的,或是小点的做LED生长的公司?请问大家我还能上哪去找工作? |
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A*****0 发帖数: 3 | 3 想自学LED方面的知识,有什么好的LED基础介绍和工艺流程方面的书吗?多谢了。 |
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B*G 发帖数: 13438 | 4 50W的白光LED就算温度没问题也就相当于100多不超过200瓦的CFL吧,你室内真的需要
这么亮么?我觉得26瓦的CFL已经相当亮了。Heat sink的热阻很容易查到,去digikey
一类的网站找个相同尺寸相同材质的就行了。然后找个Kill a watt测一下LED功率。直
接建议是要么上风扇,要么用多个小LED。
goes |
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w********n 发帖数: 137 | 5 【 以下文字转载自 StartUp 讨论区 】
发信人: waterlemon (waterlemon), 信区: StartUp
标 题: 可否推荐国内工厂可以生产 LED heat sink
发信站: BBS 未名空间站 (Thu Apr 3 23:36:19 2014, 美东)
https://www.google.com/search?q=led+heat+sink&espv=210&es_sm=93&source=lnms&
tbm=isch&sa=X&ei=ISg-U5v9B_i2sATg2YHACg&ved=0CAkQ_AUoAg&biw=1746&bih=887#q=
led+heat+sink+par30&tbm=isch
目前有个广东的厂家,老板找到,感觉是家庭作坊,
但是水平不行,老是有废品
可以回站内信箱。 |
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c*s 发帖数: 2145 | 6 送交者: led 2004年6月30日22:39:59 于 [教育与学术]http://www.bbsland.com
中村修二(Shuji
Nakamura)于1954年5月22日出生在日本。1979年至1994年期间在Tokushima大学他先后获
得电子工程专业的本科,硕士,博士学位。1979年加入日亚公司(Chemical Industries
Ltd)。1988在佛罗里达大学做访问学者一年,1989年他开始研究用三族氮化物材料做蓝
色LED芯片。1993年到1995年期间他成功开发了第一个基于三族氮化物材料的蓝绿色LED芯
片。在1995年他同时成功开发了第一个基于三族氮化物材料的紫色LDs。
他获得很多的奖励,包括:
Nishina Memorial Award (1996),
MRS Medal Award (1997),
IEEE Jack A. Morton Award,
the British Rank Prize (1998),
Cree Chair in Solid-State Lighting (2001) and
Benjamin Franklin M |
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d*b 发帖数: 21830 | 7 这个dimmer都是一般都是通过变频来改变占空比达到的,随便拆个带调光的LED的手电
就知道了。因为LED发光跟电压的关系比不是很线性。现在的LED调光电路都是带MPU要写很长的C的code的
。。
/// |
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t****g 发帖数: 35582 | 9 如果你用的是小电流的LED串做的灯,比如500mA~2A这个量级,总forward voltage
drop在10V~20V之间的这种。最简单方便的LED driver电路就是基于HV9910芯片的电路
。可以直接用100V~300V的交流加整流桥供电,芯片有linear dimming和PWM dimming两
种功能。linear dimming就是在某个管脚上加参考电压,driver电路输出的电流和参考
电压成正比。PWM dimming是使用脉宽调制做dimming。你要想做的fancy的话,你就要
用PIC或者ARM之类的MCU做个控制器,弄个液晶显示,薄膜按键开关。。。。简单的办
法也很简单,如果用linear dimming的话直接从参考电压接个电位器,给一个可变的参
考电压接到linear dimming pin上就行了。PWM dimming稍微复杂一点,但是也不难,
用个555之类的时钟芯片搭一个可调占空比的方波电路,接到pwm dimming上就行了。这
两个我都做过。
总的来说LED因为本质上是个二级管,所以驱动方式和普通的灯泡完全不一样,以前那
种用电阻(这个 |
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w*******y 发帖数: 60932 | 12 hhgregg has a good deal on a LG 47LH90 - 47" 1080p 240Hz LED HDTV. $999.97
plus taxes. Free in store pickup. They also have a flat shipping fee for
$150.
Link:
http://www.hhgregg.com/ProductDetail.asp?SID=n&ProductID=23039
Specs:LED Technology uses a full array of LED backlights which control the
level of brightness for amazing clarity and color detail
240Hz TruMotion Technolgy virtually eliminates motion blur for fast motion
clarity
Intelligent Sensor automatically optimizes the picture to |
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w*******y 发帖数: 60932 | 14 Buydig.com is offering the following instant coupon deals on some 46"
Samsung HDTV's ranging from 60hz LCD to 240hz LED 3D HDTV's.
All have Free Shipping and do not have tax (except for NJ)
Prices are competitive when compared to reputable authorized sellers
1080p 60hz LCD:
LN46C550 - $815
1080p 240hz LCD w/ 3D:
LN46C750 - $1219
1080p 120hz LED:
UN46C6500 - $1389
UN46C6300 - $1189
1080p 240hz LED w/ 3D:
UN46C7000 - $1719
UN46C8000 - $1849
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w*******y 发帖数: 60932 | 16 55" LG 55LE5500 1080p 120Hz LED HDTV + LG BD550 Blu-ray Disc Player + LG
ANWF100 Wi-Fi USB Adapter + Articulating Wall Mount + 6ft HDMI Cable $1599.
99:
https://www.paulstv.com/LED-Televisions/LG-55LE5500.asp
this is the same company whom you may ordered 47 inch via Buy.com
LIMITED TIME OFFER!
For a limited time, purchase the LG 55LE5500 LED television and recieve the
following items FREE!
* FREE BD550 Blu-ray Disc Player *
* FREE ANWF100 Wireless Internet Adaptor *
* FREE LSW400BG Articulatin |
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w*******y 发帖数: 60932 | 19 For all the tiki torch solar LED light fans. Malibu Tiki Torch Solar LED
Light is on sale for $9.99 at Orchard Supply Hardware ( OSH ) this weekend
in southern California. OSH will pay your sales tax this weekend. Also,
you can use one of their $20 off $50 coupon. Click below to get your coupon
.
http://www3.slickdeals.net/forums...&t=2160666
If you buy 5 tiki torch LED lights with a $0.05 filler item in one single
transaction, you will only pay $6 for each tiki torch light out the door.
S |
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w*******y 发帖数: 60932 | 20 Amazon has the streamlight 73001 led light for 6.99 shipped w/prime.
Link:
http://www.amazon.com/Streamlight-73001-Miniature-Keychain-Flashlight/dp/B0011UIPIW/
Seems to have fairly goodreviews.
Keep in mind this light is tiny, but the light itself is very good.
Case material is machined aircraft aluminum with anodized finish
Parabolic shaped LED area optimizes beam performance
5mm white LED, impervious to shock with a 100,000 hour lifetime
Up to 8 hours declining usable output
1.47-Inches length |
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w*******y 发帖数: 60932 | 21 1 PackBright 5 LED Head Lamp, Flash Function and Adjustable Head Band,
Powered by 3 AAA battery NOT Included, Removable Lamp with A Magnetic Button
to place on Metal Surface, Perfect for Garage use, Camping or Outdoor
Activities - $0.99
Coupon Code :MLCK2480010 92467NL1 Starts On : 9/24/2010 5:00:00 AM limit
1000 uses
Link:
http://www.meritline.com/led-flashlight-206-flesh---p-25400.aspx
1 PackBlack 1000mA Mini USB Car Charger for iPhone 4,iPhone First Generation
iPhone 3G, iPhone 3GS -$0.89 |
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w*******y 发帖数: 60932 | 22 NOTE - you can add up to 6 in one order. Pretty cheap compared with the
market
From Site: Link:
http://house.thingfling.com/
This Westek 21.5in Under Cabinet LED Light Bar is perfect for you kitchen,
under cabinet lighting, mood lighting etc...
With a slim profile that hides almost anywhere, these LED light bars are the
perfect solution for your lighting needs.
* Surface Mount
* Thin 5/8" profile hides behind most cabinet lips.
* Includes mounting and installation hardware.
* 6ft... 阅读全帖 |
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w*******y 发帖数: 60932 | 24 LG 42LE5500 - 42" Widescreen 1080p LED HDTV w/ FREE Articulating Wall Mount
- 234wer
Buy.com makes you go to final checkout to see the low price.
Same deal as newegg earlier but with a free wall mount. For reference this
is the newegg thread http:// et/forums/sh...?t=2277129
LG 42LE5500 42-Inch 1080p 120Hz LED HDTV with Local Dimming It was a good
deal then but even better with articulating wall mount included
Link:
http://www.buy.com/prod/lg-42le5500-42-widescreen-1080p-led-hdtv-w-free-articu... 阅读全帖 |
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w*******y 发帖数: 60932 | 26 Multi-Colored Changing LED Snow Man Light for Christmas
Link:
http://www.shop4tech.com/item9626.html
Specifications
* LED light color: Multi-Colored
* Battery: 3*AG13 button cell batteries (included)
* Dimensions (D*H): 78.0*148.0mm
* Weight: 71.0g
Package Included: 1 x Multi-Colored Changing LED Snow Man Light for
Christmas
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w*******y 发帖数: 60932 | 27 Multi-Colored Changing LED Snow Man Light for Christmas:
http://www.shop4tech.com/item9626.html
coupon code NM15 gets you 15% off / exp. 11/14
Specifications
* LED light color: Multi-Colored
* Battery: 3*AG13 button cell batteries (included)
* Dimensions (D*H): 78.0*148.0mm
* Weight: 71.0g
Package Included: 1 x Multi-Colored Changing LED Snow Man Light for
Christmas
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w*******y 发帖数: 60932 | 28 8 in 1 Outdoor Mini Survival Kit (Including LED Flashlight, Compass,
Thermometer, Magnifier, Whistle & More):
http://www.meritline.com/8-in-1-survival-tools---p-32508.aspx
$0.99 Shipped @Meritline with Coupon Code MLCK4000611109AL1 Limit 800
Orders
This 8 in 1 Outdoor Mini Survival Kit Including LED Flashlight, Compass,
Thermometer, Magnifier, Whistle & More!
Features:
Survival Whistle.
Compass.
High-precision thermometer.
Survival reflective? signal mirror.
Magnifying glass.
High-white LED fl... 阅读全帖 |
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w*******y 发帖数: 60932 | 29 Nice everyday flashlight, almost same size as a 1AAA battery. Good for
keychains.
Add to cart for 30% off one outlet item.
Link:
http://www.rei.com/product/798305
The Fenix L0D LED flashlight is extremely small and extremely brightthis
light will keep your path well lit with its 75 lumens of power on high!
LED bulbs cast even, white light that's good for close-in lighting; nearly
indestructible LEDs greatly improve battery life
Flashlight is constructed of durable aircraft-grade aluminum with ... 阅读全帖 |
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w*******y 发帖数: 60932 | 31 Staples has the AOC e2243Fw 21.5" Widescreen 1080P Super-Slim LED Monitor
for $120 (+tax) or $96 AC (+tax) with free shipping. Dollar off coupons can
be had from places such as Ebay and and Ejunkie for $2-3.
Staples linky: Link:
http://www.staples.com/AOC-e2243Fw-21.5-Widescreen-LED-Monitor/product_911741
The monitor has VGA + DVI (w/ HDCP) ports. Does not have built-in speakers (
which are many times garbage anyway) nor separate HDMI port (you can use a
DVI/HDMI adapter instead). It is extremel... 阅读全帖 |
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w*******y 发帖数: 60932 | 33 LG 47LE8500 47" Local Dimming LED HDTV $999 @ Frys
Frys has the LG 47LE8500 47" 1080p 240Hz LED HDTV for $999 with free in-
store pickup. This is a top tier videophile set with full array LED
backlighting with local dimming and built in wireless and apps.
Shipping to home option is $100. Discount is reflected at final checkout.
cnet rating: Excellent
Link:
http://reviews.cnet.com/flat-panel-tvs/lg-infinia-47le8500/4505-6482_7-33957045.html
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w*******y 发帖数: 60932 | 34 LG 47LE8500 47" 240 Hz Local Dimming LED HDTV $1100 with Free Shipping from
Buy.com
This is a new deal since the Frys front page deal expired
Buy .com has the LG 47LE8500 47" 1080p 240Hz LED HDTV for $1100 with FREE
SHIPPING.. This is a top tier videophile set with full array LED
backlighting with local dimming and built in apps and wireless capable.
THX certified
Wireless HD
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w*******y 发帖数: 60932 | 35 Westinghouse LD-2655VX 26-Inch 720p LED HDTV $167.60 Free Shipping Amazon
Amazon has the Westinghouse LD-2655VX 26-Inch 720p LED HDTV for $167.60 with
free shipping.
Brand Name: Westinghouse
Model: LD-2655VX
Display Technology: LED-lit
Display Size: 26 inches
Two HDMI inputs
Link:
http://www.amazon.com/gp/product/B003TDIBWE/ref=ord_cart_shr?ie
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w*******y 发帖数: 60932 | 36 1 Pack5 LED Hat Clip Light, 3 Modes, with 2 Red Side Safe LED Light,
Adjustable Angle, NR904 (More Details)
Coupon Code :MLCK403149011873AL1 limit 1000 uses
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w*******y 发帖数: 60932 | 37 55" Vizio LED 3D 1080p 480Hz SPS HDTV $1,797 after $200 Instant Savings
Link:
http://www.samsclub.com/sams/shop/product.jsp?productId=prod190 after $200 Instant Savings* 55" Vizio LED 3D 1080p 480Hz SPS HDTV
SPECIFICATIONS
Picture/Display:
Class: 55"
Viewable: 54.64"
Backlight Type: Full Array LED
Resolution: 1080p
Signal Compatibility: 1080p, 1080i, 720p, 480p, 480i
Colors: 1.06 billion
Dynamic Contrast Ratio: 10,000,000:1
Refresh Rate: 480Hz
Brightness: 500 nits
Response Time: 4 ms
Viewable: ... 阅读全帖 |
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w*******y 发帖数: 60932 | 38 LG 55LE5500 54.6" Full HD Broadband LED Backlit LCD TV - 1080p, 1920x1080,
16:9, 120Hz, 5,000,000:1 Dynamic, Wireless Ready, 2.4ms, 4 HDMI $1099 before
Ship/Tax
Link:
http://www.frys.com/product/6214140
With NetCast:
NetCast Entertainment Access delivers the Web's best entertainment and
services direct to your TV from the Internetno computer required
Will need the LG USB wifi dongle:
http://www.frys.com/product/6226370?site=sr:SEARCH:MAIN_RSLT_PG
for Netcast ($37 at Frys.com)
Product Features
... 阅读全帖 |
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w*******y 发帖数: 60932 | 39 Here are the ads for this week.
Samsung ml2525 = $50
Panasonic Plasma - $399
Free Software:
Spysweeper 2011
Panda IS 2011
Trend Micro Titanium IS
Iolo System Mechanic Pro
Serif Photoplus X4
Norton AV 2011 + PC Tools Registry Mechanic
TV:
47 LED = $600
55 LED = $1100
32 LCD = $300
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w*******y 发帖数: 60932 | 40 Just got this in the email:
Link:
http://reviews.cnet.com/exclusives/?tag=nl.e794
CNET and Newegg have teamed up to bring you an incredible selection from
these two Toshiba HDTV's - 55" LED-LCD or 40" LCD. Both features a 1920 x
1080 (1080p) resolution, HDMI ports and CineSpeed Panel. Buy the Toshiba 55"
LED-LCD HDTV for $1,199.99 or the Toshiba 40" LCD HDTV for $399.99! Or Buy
both!!!
Get the 55" for your living room and the 40" for your bedroom. But,
quantities are limited so hurry and buy now... 阅读全帖 |
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w*******y 发帖数: 60932 | 41 Sony BRAVIA KDL46EX710 46-Inch 1080p 120 Hz LED HDTV, Black
from amazon for 899 + FS (no tax)
Link:
http://www.amazon.com/Sony-BRAVIA-KDL46EX710-46-Inch-1080p/dp/B
details
Full HD 1080p Resolution: Experience Full HD 1080p picture quality, the
highest at-home resolution, and take full advantage of HD sources like a Blu
-ray Disc Player or PlayStation3 gaming console via the 16:9 wide screen
panel (1920 x 1080).
Edge LED backlight: Enjoy a slim design plus amazing dynamic contrast with
an Edge LE... 阅读全帖 |
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w*******y 发帖数: 60932 | 42 PC Connection Express has the Viewsonic 22" VA2231W-LED Monitor for $119.95
with free shipping. Looks like the lowest price by about $30 for a pretty
solid monitor. Tax only in Alabama, Illinois, New Jersey, New York, North
Carolina, and Ohio.
- 21.5in LED-backlit, TFT Display / 1920 x 1080 Max Resolution / Digital
Visual Interface (DVI)
- 5ms Response Time / 1000:1, 10,000,000:1 Contrast Ratio / 250cd/m2
Brightness
- 170/160 Viewing Angle (H/V) / 0.248mm Dot Pitch / Tilt / 3 Years Warranty
Link... 阅读全帖 |
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w*******y 发帖数: 60932 | 43 Newegg is currently offering the Asus US VH238H. The sale price is $159
after mail in rebate.
The sale price is $209-$10 MIR. You need to add promo code - EMCKHJE29 for
an extra $40 off!
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236117
Next best is $177.98 (no idea on FS or tax) and Amazon is currently at - $
199.99
The VH238H by ASUS mixes visual excitement with modern sophistication.
Powered by LED backlight technology, the VH238H delivers sharp, true-to-life
images wit... 阅读全帖 |
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w*******y 发帖数: 60932 | 44 Staples has this monitor as well as some other ones for sale next week 2/20-
2/26. Pretty good price IMO since staples offers awesome coupons. They also
have an Acer 24" LCD Monitor as well but I prefer HP monitors over Acer.
Anyone have any opinions on this.
Obviously I am in the market for a new monitor (either 23"-24" must have
HDMI and Speakers are a plus but not needed). LED is also a must unless
anyone here has a reason why not? Also, anyone have experience with a glossy
screen vs a matte ... 阅读全帖 |
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w*******y 发帖数: 60932 | 45 Smith & Wesson SW3CRLL Galaxy 4-in-1 3Watt Cree LED Flashlight:
http://www.buy.com/prod/smith-wesson-sw3crll-galaxy-4-in-1-3wat
Features
Video Features 4-in-1 uses: Flashlight, Lantern, Emergency flashlight,
Work light
Video Features 3 Watt CREE LED lasts over 100,000 hours and will never
break, no bulbs to replace
Video Features 100 lumens of brilliant white light
Video Features Run time 12 hours constant ON or Flashing Modes
Video Features Magnet in tailcap for hands free u... 阅读全帖 |
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w*******y 发帖数: 60932 | 46 Buy.com offers the 5.73-lb. Acer Aspire AS5736Z-4826 Pentium Dual-Core 2.
3GHz 15.6" LED-Backlit Widescreen Notebook, model no. LX.R7Z02.046, for $359
.99. It features an Intel Pentium Dual-Core T4500 2.3GHz processor, 15.6"
1366x768 LED-backlit widescreen LCD, 2GB RAM, 250GB 5400 rpm hard drive,
dual-layer DVD burner, flash card reader, 802.11n wireless, Gigabit Ethernet
, webcam, HDMI, 6-cell battery, and Windows 7 Home Premium 64-bit.
link:
http://www.buy.com/prod/acer-aspire-as5736z-4826-15-... 阅读全帖 |
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w*******y 发帖数: 60932 | 47 TigerDirect is offering a significant coupon deal on this Sony BRAVIA KDL-
46NX810 46-Inch LED TV!
For a big price cut you can get your hands on this large 46-Inch Sony BRAVIA
LED TV! This TV features full support for 1080p High Definition video as
well as full 3D to bring your experience to a whole new level and double
your quality! This TV uses LED technology and is therefore razor thin with a
tiny bezel to give you as much screen space as you would want! Also
features Dynamic backlighting to ... 阅读全帖 |
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w*******y 发帖数: 60932 | 48 Target has the VIZIO 22" Class 1080p 60Hz LED LCD Internet Connected HDTV -
Black (M220NV) for $249 in store and online. (Runs apps like Netflix, etc -
wirelessly)
LINK:
http://www.target.com/VIZIO-Class-1080p-Internet-Connected/dp/B
Description
This Vizio 22" Razor LED LCD HDTV with Vizio Internet Apps puts the best
of the web right on your TV screen, giving you the convenience of on-demand
movies, TV shows, social networking, music, photos and more at the push of
a button. With built-in Wi... 阅读全帖 |
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w*******y 发帖数: 60932 | 49 Frys is having their weekend sale! The LED 3D TV for sale is the
Sony KDL40EX720
40" 3D LED HDTV,1080P,240HZ, X-REALITY ENGINE,INTERNET TV,2D & 3D
Some specs -
Fusing a striking picture with elegant design, Edge LED backlit BRAVIA EX720
Series LCD HDTVs are packed with state-of-the-art technology, including 3D
in Full HD 1080p. Watch your favorite fast-action movies and sporting events
in crystal clear detail to X-Reality Engine. In addition to advanced
energy saving features, this HDTV is Wi-... 阅读全帖 |
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w*******y 发帖数: 60932 | 50 The lowest price I found online was 1,599...this set regularly sells for
over 2,000
$1100 OFF - Sony BRAVIA XBR46HX909 46" 3D LED Backlight HDTV 1080p
Motionflow 240Hz Infinite Contrast Ratio BRAVIA Internet Video DLNA
Certified $1399.99 shipped after COUPON CODE: EAU25201 at TigerDirect:
http://www.tigerdirect.com/applications/SearchTools/item-detail
Enjoy a vanishing edge Monolithic design when it is off, plus improved
picture accuracy and deeper blacks with the OptiContrast panel technology
w... 阅读全帖 |
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