2012年1月31日星期二

Why every LED module has a resistor?


Why every Channel letter LED modules has a resistor? The simple answer: to limit the current  in the LED to a safe value.
The detail factor as followed: LEDs are semiconductors, diodes in particular. The current flowing in an LED is an exponential function of voltage across the LED. The important part about that for you is that LED forward current is not linearly related with forward voltage. That is the most important concept of LEDs. Resistors aren抰 like that. The current and voltage in a resistor are linearly related.
Flexible LED Strips    www.bgocled.com

White windmill move follow the wind during the day is a beautiful landscape



 in the evening it turn into a bright light-emitting sculpture which can also be a beautiful night.

Unique LED light windmill located in the northern German city of Hanover, designed by the French artist Patrick Renault, he added decorative lights in large wind turbine blades and tower, make LED light bulbs shine colorful light with the the fan rotation produced fantastic results, LED power supply is also provided by the wind turbine, when the wind up, LED lights will be more bright, beautiful and shining in the night sky.
  www.bgocled.com

2011年12月23日星期五

Range Resources fizzles, energy stocks stay weak



By Steve Gelsi, MarketWatch
NEW YORK (MarketWatch) — Energy stocks wrapped up a dismal week with more losses Friday as natural gas shares led the way into the red, but First Solar Inc. moved up as the broad equities market rebounded modestly.
The Dow Jones Industrial Average

/quotes/zigman/627449/delayed DJIA
+0.35%


 rose 38 points, but provided little lift for the energy sector.
Click to Play

History says bullish third year

‘Ahead of the Tape’ columnist Kelly Evans explains the third year of a presidency is typically and up year for the SP. Not so in 2011.
On the heels of two days of steep losses, the NYSE Arca Oil Index    www.bgocled.com

House, Senate clash anew over disaster aid bill


WASHINGTON — Congress’ latest must-pass bill is prompting a new House-Senate showdown, highlighting a partisan rift so raw that an effort to help disaster victims has become mired in disputes over jobs, the national debt and the discredited Solyndra solar energy company.
The Republican-led House approved revamped legislation early Friday providing $3.7 billion to help people battered by Hurricane Irene, Texas wildfires, tornadoes and other natural disasters. The money would replenish an emergency fund that Homeland Security Secretary Janet Napolitano warned could be depleted early next week.
The measure would also prevent a federal shutdown next weekend by financing government agencies from the Oct. 1 start of the new federal fiscal year through Nov. 18. It was approved by a near party-line 219-203 vote shortly after midnight.
Leaders of the Democratic-run Senate promised to quickly kill the legislation, saying it lacked enough disaster assistance. Democrats also complained about cuts it would make to help pay for the aid: trimming $1.5 billion from Energy Department loans aimed at spurring development of fuel-efficient vehicles, a program they said is creating badly needed jobs.
“They insist on holding out on Americans who have suffered devastating losses,” Senate Majority Leader Harry Reid, D-Nev., said of GOP lawmakers. “Americans are tired of this partisanship. They deserve to know that when disasters strike, we will be there to help them.”
The Senate version, approved last week with the support of 10 GOP senators, provided $6.9 billion in disaster aid and no cuts to help pay for it.
White House spokesman Jay Carney faulted House Republicans for the deadlock on Friday, saying they had passed legislation knowing it would die in the Senate, just as they had during last month’s fight over extending the federal debt limit.
“The fever hasn’t broken — the behavior that we saw this summer that really repelled Americans continues,” Carney said.
A spokesman for House Speaker John Boehner, R-Ohio, blamed Democrats, saying the House-passed bill had enough money for the Federal Emergency Management Agency in the short term and that Congress could provide more money later.
“The Senate Democratic leadership is essentially threatening to delay FEMA money that families need right now for a partisan gain,” said the spokesman, Michael Steel.
It was unclear how the standoff would be resolved. The House and Senate had both planned to take next week off, but neither seemed likely to risk accusations of ignoring the thousands of Americans victimized by natural calamities or of allowing the government to shut its doors.
“We’re establishing priorities,” said Rep. David Dreier, R-Calif. “We have a priority, that being dealing with our fellow Americans.”
House passage represented a reversal from an embarrassing setback the chamber dealt its Republican leaders on Wednesday. On that day, the House rejected a nearly identical measure, shot down by Democrats complaining its disaster aid was too stingy and conservative Republicans upset that its overall spending was too extravagant.
The bill the House approved Friday morning contained just one change — an additional $100 million in savings from cutting a second Energy Department loan program, this one aimed at sparking new energy technologies.
That is the same program that financed a $528 million federal loan to Solyndra Inc., the California solar panel maker that won praise from President Barack Obama but has since gone bankrupt and laid off its 1,100 workers. The Obama administration had praised Solyndra as a model for green energy companies, but now Congress is investigating the circumstances under which the government approved the loan.
Forty-eight Republicans had voted against the bill on Wednesday, a number GOP leaders cut in half in Friday’s vote after hours of lobbying. One who switched from “no” to “yes” was conservative Rep. Jeff Landry, R-La., who said he was swayed by the new cuts in the technology loan program.  www.bgocled.com

2011年12月12日星期一

LED Tree Sculpture Aurora Will Light Up Burning Man



Self-taught sculptor Charlie Gadeken likes to play with fire, as evidenced by his blazing body of blowtorch artwork. But for his latest piece,Aurora, the San Francisco-based kinetic wizard has chosen LEDs to light up a massive tree that's programmed to mutate colors from day to night.
www.bgocled.com

Boise's cross getting LEDs, to be even brighter



A six-story mountaintop cross whose 2,100 watts of white light have illuminated the Boise night since 1956 is going green - and gettingeven brighter. The private group that owns the cross atop Table Rock is replacing its electricity-devouring fluorescent tubes with 2,600 energy-efficient LED lamps to cut the power bill from about $60 monthly to just $20.
www.bgocled.com