How to solve LED’s disadvantage for general lighting purpose?
Meiyu Z asked:
current LED screw-in light bulbs offer either low levels of light at a moderate cost, or moderate levels of light at a high cost. In contrast to other lighting technologies, LED light tends to be directional. some current models of LED are not compatible with standard dimmers. It is not currently practical to produce high levels of room lighting.
current LED screw-in light bulbs offer either low levels of light at a moderate cost, or moderate levels of light at a high cost. In contrast to other lighting technologies, LED light tends to be directional. some current models of LED are not compatible with standard dimmers. It is not currently practical to produce high levels of room lighting.
Nope, it doesn’t seem promising does it? [who] mike1942f
I believe that LED lighting wil replace many forms of general lighting.
I believe that the LED’s will be encased in a bulb with a reflective coating that will disperse the light, being diode based, cost will ultimately be reduced by mass production, smaller arrays will allow for higher light levels.
I also believe that there will still be other styles of lighting for special purposes.
This is al driven by Uncle Sam.
The incandescent light is being phased out. [who] BIG Al
LED powers up by DIRECT CURRENT. Each standard color LED rates at 1.6 to 2 volts. The WHITE LED may run at 3 volts DC. Its light element is so small therefore it requires to combine many white LEDS to make a light bulb and its light mostly close to the purple-blue color (not a pure white like the Sun light). LED itself is a diode,as we apply AC to it,it converts AC into DC and light up. But it blinking 60 times per second as it powers with AC directly. Therefore,to power the LED with pure DC,we get a better light. Light dimmer using Traic to control AC. This kind of dimmer shall not work with DC. [who] lee26loo
It is even worse. They don’t save any money in the winter.
The excess heat of an incandescent goes into heating the house lowering the heat load on the furnace. Install a CFL or an LED and you will have to increase the input energy to the furnace. The net savings is ZERO or near zero…
The reason the LED is having such a problem in “going public” is in the nature of its waste heat. The waste heat of the incandescent mostly radiates away as infrared. Also, the incandescent loves heat – the hotter it gets the better it works (up to a point).
The LED radiates little heat and so ALL excess heat has to be removed by conduction and convection. To make matters worse LED’s don’t do well at even moderately elevated temperatures.
But the real problem is now upon us. GE has introduced a high priced LED 120V bulb that emitts 100 lumens for a input power of 4 Watts. THAT IS ONLY 25 Lumens per Watt. An incandescent gets 15 lumens per Watt and costs next to nothing. It is a major Rip Off.
The LAB power record for an LED is ten times that number at 250 lm/W. It is easy to buy power LEDs at 100lm/W. There are some 120V screw-in bulbs available at 60 lm/W. GE is going to put a really bad taste in peoples mouth for LEDs. How does GE justify an LED light that gets the same efficiency as a halogen light gets. [who] David D
Here is a site which advertises AC LED lights. From the page: “Low voltage DC operation (12V AC/DC) or Mains voltage operation (Input voltage between AC 85V and AC265V, Or any voltage for customized design.)”
I have seen red and green in use in traffic lights for several years. [who] gc-p