Can LEDs emit as much bright light as fluoresent lamps?

http://en.wikipedia.org/wiki/Luminous_efficacy

If you have enough of them YES!

Expensive though... John.

certainly yes.

In fact, its put into use on the market now.

a 100w has been developed and was use for street lighting.

many cars lamp use it instead of tradional lamp.

Meanwhile the efficiency is so good that they can emit even more power. Thats one of the reasons for replacing fluorescent backlights for displays by LEDs. Another advantage is that you have less EMI because you need no HV-inverters which must be cross-calculated (combined with lifetime aspacts) to the (this time) higher LED-costs.
Regards Uwe

Plus you can eliminate the mercury which is a miserable environmental problem when the lamp is thrown away. Why the politicians are mandating flourescent tubes instead of LED arrays I can not understand.

The overall costs of LED vs. flourescent vs. incandescent would have to put the LED light as the best option.

Because, as usual, politicians, and the mass market, are behind the technology curve. Politicians are mandating fluoresent tubes to replace incandescent lighting, which is even less efficient. Not sure if LED lighting costs have come down to make them competitive with fluorescents, which can be easily justified versus incandescents by longer life and higher efficiency.

Have you seen LED lamps in your home improvement store lately at a competitive cost? I haven't.

YES THEY CAN...I AM A SALESMAN FOR A NEW ENERGY COMPANY STARTING JUNE 2, 2008.

LETS BAN FLOURS AND CFLS AND STOP THE MERCURY POISIONING AND GET ON WITH BEING A SMART WORLD SHALL WE?

BIODIESEL, SOLAR PANELS (3D), LED LIGHTS, BETTER BATTERIES, BETTER FUELS, BETTER LIVING THROUGH ENGINEERING!! LETS DO IT!! I AM! SEE YA IN THE FUTURE!!

What markets are you going after?

Wel, that's nice, you're starting a new company on my birthday. Will we get an opening announcment with details? Will you be selling in small lots or just wholesale?

thanks & best of luck

AAndy

Ca1ic0cat, if you read the technical reports on why compact fluorescent lamps are being encouraged you will see the over the life time of the fluorescent bulb the energy saved is much more than an incandescent bulb, and the power savings at a coal fired power station reduce the amount of natural mercury that they produce by more than the 10 to 20 mg of mercury in each bulb.

So the amount of mercury in the bulb is offset by the saving of mercury being generated by more power hungry incandescent bulbs.

John.

I have been playing with white leds since they came on the market in 2000- the benefit of white leds is a white light(not yellow as in incandescent) this is achieved by a phosphor in the led(without would be blue)- as to amount of light, this is directly related to power in/ power out/ efficiency/ heat. If trying to achieve watts of incandescent, for example, the led quickly burns out, as heat can not be radiated as in incandescent(90%)- BUT LEDS have use as personal torch but even there manufacturers use maybe 26 leds, trying to get as much light as an incandescent, but the power consumed is as much!(nice white light though). I personally use a torch with 3 30Cd leds, powered by 3 AAA NiMh cells- they seem to give light for ages(many,many hours)- I have played with inverter circuits that step up frequency to give as much light output from single led (30mA) as 30Cd(95mA), but the circuits take too much power to run, compared to my simple 3 led setup. The bottom line is that everything equates.

The real reason, of course, is that the fluorescents take so long to come on.

Really? How long is "so long"? One second, two seconds, three? Except when a CFL gets really old and is about to die, I have noticed a lag of only 1-2 seconds, sometimes less, almost instant with some CFL's. Isn't the energy savings, and the less frequent bulb changing worth far more than the slight nuisance of a short lag in "on-time"? It certainly is for me!

Also, unless you heat your house with resistive electrical elements, you may indeed be wasting some energy in partially heating your home with incandescents. Even an electric heat pump would be more efficient. LP, natural gas, or even oil should be more cost effective than electricity, unless you live in an area abundant in cheap hydro-electric power sources. In rural Scotland they still burn peat which smells nasty (I guess you get used to it) in room fireplaces and some furnaces because it is basically free. All it costs is your time and effort in cutting and stacking it to dry every spring/summer. Of course, it probably isn't very good for carbon reduction!

Burning LEDS is the consequence of having made a bad thermo management and so wasting a lot of money for expensive unsafe operated parts. As in all semiconductor devices reducing their sizes leads to thermo stress which has to be accomplished. Especially LEDs with their high output power (optical and, because of their excellent efficiency, electrical, too) need a sophisticated mounting. New and expencive materials like aluminium nitrid are the answer on this challenge. Only "Playing" with these parts means burning fingers, you can only avoid this by a rugged construction which is able to dissipate as the application requires this.

Go to website ddpled.com.

they are based in california.

thay have a world of solutions.

The measure used to determine light output is largely mis-understood. Of the choices, the most common unit of measure is the lumen. The best light sources produce over 100 lumen per watt. LED's can do that, but you need a lot of them to produce the thousands of lumens that a fluorescent lamp produces. LED's have been used for street lighting in Europe since 2004 or 2005. We have them in most of our stop (or traffic signal) lights now. With the advent of the multi-color (multi-diode) LED in a single die, we now have multi-color LED signs that just turn on various diodes to create any color you want. Imagine mood lighting where you can change from warm white (like an incandescent) to bright white (like daylight). You can't do that with a fluorescent because the powder determines the color.

I wonder if that's how Morimoto's restaurant in Philly does their color transitioning. All the booths are sheeted in translucent white plastic and illuminated from inside the seat. The colors definitely change but it's almost impossible to actually see them change. It's the smoothest transition I've ever seen. Tri-colored LED's could do that... I think...

its very easy job.

some of them are white color led, others can be cosist of two color, three color leds can consist of all kind of color for a pic. but attention, three color led pic is not consist of only three leds, but four leds in a set usually.

In the lab, we can do the led at more than 100lm/w, but in practice its only 60lm/w in average.

Many led street lamp are coming from China. they are consist of 100 or 200 or more led bulbs in a set to get more brighter lignt and more save engery than other lamp. but to get an ideal warm white color is still a problem. most of the white led has more color temperature.

I dont know other countries, but our cities in China are almost led traffic signal lamp.

its easy to get a pic by arrange led as matrix range.