LED lamp

LED lights, high efficiency, energy saving, therefore, want to install some try. The finished lamp on the market is expensive, Wal-Mart sells LED lights, a small ordinary 90 is eight to nearly two hundred dollars, so the lamp for ordinary families, although section can, but the cost is too high.

I Taobao looked ,3-5W LED lamp beads are only a few dollars a cheaper, 1W of even just a few cents or a dollar or two a. But how these lamp beads to form the lamp lighting, how to do it?

I have the following questions:

1, a ten to twenty-square-meter room, to achieve better lighting, how many lumens?

2, the voltage of the LED lamp beads is how much? 5V DC power supply connected to the LED lights on when, how many grains of lamp beads series? 30V DC power to the number of tandem (so do you)? The current of each lamp beads mA? LED is very sensitive to fluctuations in the power supply (own transformer and rectifier bridge rectifier)?

3, high-power lamp beads, like 3-5W (its own cooling fan base) also need additional heat sink?

If the new house is renovated, is not to prepare for the future of a group of low-voltage LED lighting line? This can use only a total of the low-voltage power supply, rather than each of the lamps on both the low voltage power supply used.

Thank you very much.

1, home lighting for home lighting, daily use of time an average of about 4.3 hours, power-down feature that can create effective use of the lack of time and limited only expect LED bulb / lamp luminous efficiency increased dramatically, and guide the light bulb / The lamps cost of rapid decline, in order to spread to ordinary families.

2 white LED operating voltage of about 3.5V, 5V DC voltage only for a white LED, not in series use; factory that production can pick classification, a few LED parallel work. Own system conditions, only one LED series in parallel and then use a current limiting resistor. The 30V voltage 8 series. Current is typically 20mA.

4, due to the problems in the first asked the LED lamp is mainly used for the street unit lighting and other occasions, have not generally entered the homes of local residents. But after widespread use, there will be 220V AC lighting products, can not only set the low-voltage power lines in the home.