Comments on: LED Equivalent to 100-Watt Bulb Announced

By: Guest

Guest — Sat, 08 Oct 2011 12:54:00 +0000

Obviously you know nothing of Lithium batteries and less about lighting. Todays Prizmatic batteries will last at (80% charge rate) 3000 cycles and at (70% charge rate) at least 10 years in my vehicle. If you ever ride or drive a real Lithium Yittrium vehicle you will not want to go back. Yes LED lighting has not yet reached the place to take advantage of mass production. The public still is not educated in the US yet. Look at EVTV.ME if you want to learn something about the common man doing conversions, like me. I paid $9 a gallon or $14 a gallon while living in Europe. I will not do it here.

By: Dlatif

Dlatif — Wed, 10 Aug 2011 23:53:00 +0000

I do hope that India will start to produceLED lighting – if they are not doing so now.
The future is excellent like Apple Computers make this happen.
Dawood Latif.
Hamilton, New Zealand.

By: James Smith

James Smith — Wed, 08 Jun 2011 11:05:00 +0000

It’s good to see continual progress is being made with the high-efficiency LED lighting. Here in Brazil, almost all home lighting is via Compact Fluorescent Bulbs as is most businesses. I have a couple of the early LED bulbs for area lighting but the quality of the light is not op to the CFB or incandescent lights.

No matter how good the LEDs become, there will be those that complain the “aren’t the same” as they have complained about e-books, automatic transmissions, automotive self-starters and every other new thing since the invention of fire..

By: James M. Van Damme

James M. Van Damme — Tue, 07 Jun 2011 13:20:00 +0000

Oh, I forgot to add that while LEDs produce less heat than incandescents, they are very sensitive to heat, being semiconductors. Also, you don’t need batteries when you have a power grid; that’s a big waste of money.

By: James M. Van Damme

James M. Van Damme — Tue, 07 Jun 2011 11:52:00 +0000

LEDs need to be operated from constant current DC. The power supplies take the 60 Hz AC voltage and convert it and regulate it. This takes discrete semiconductors (transistors) and/or, ICs, transformers, and capacitors. The semiconductors are very sensitive to heat, as are the LEDs, so you have to carefully cool them or the lifetime will be very short. The capacitors degrade with heat and time and may be a long-term failure mode. I’ve given LEDs in the hardware store the touch test and I don’t like them; too hot to keep my hand on. Has anybody done testing to see when they really fail at these temperatures?
BTW you can run LEDs off of DC but you still need a voltage to current converter. Flashlights get away with it because they use the internal resistance of the battery as a ballast. Not very efficient but who cares.

By: Mowenwanders

Mowenwanders — Sun, 05 Jun 2011 20:42:00 +0000

Looks really dim in the picture

By: Bruce Miller

Bruce Miller — Tue, 24 May 2011 20:41:00 +0000

Typically LED’s, single ones, in the lab, fed proper D.C. currents produce no heat at all. Why the heat? Does the heat produced imply wasted electrical energy, not converted to light? Can LED arrays be operated from Solar, Wind, Wave, Tidal generated, battery stored, D.C. at lower, matching voltage power-sources without heat losses?
We need domestically produced NiMh batteries without expensive lithium in them to make Solar, Wave, Wind, Tidal electricity a practical reality for Americans. Where did the good ones, the ones in the EV-1 electric cars go? Add them into this picture and LED lighting could really take off!

By: Drbonesteel

Drbonesteel — Thu, 19 May 2011 19:01:00 +0000

Most of the power is used in the transformer while the smd’s get pretty warm, using dc power increases the efficiency, and the hilarius part is the availability of 100 watt lumens for 35$ on ebay 6500kelvin, and what a fixture!

By: Anumakonda Jagadeesh

Anumakonda Jagadeesh — Thu, 19 May 2011 17:37:00 +0000

Excellent. LED equivalent to glow of 100W is indeed a boon where bright lighting is needed. LED is the future lighting option.

Dr.A.Jagadeesh Nellore(AP),India

By: Anumakonda Jagadeesh

Anumakonda Jagadeesh — Thu, 19 May 2011 17:37:00 +0000

Excellent. LED equivalent to glow of 100W is indeed a boon where bright lighting is needed. LED is the future lighting option.

Dr.A.Jagadeesh Nellore(AP),India