Which Would Be More Efficient the a Normal 100W Ind. Bulb Or White Led?

It depends on the particular LED... Also, one of the big problems with LEDs is that they give out very monochromatic light - basically all of the light is in a single (or a few) very tight frequencies, and it does not tend to look as good. LEDs peak at around 100 Lumens / Watt. Regular light bulbs get around 15 Lumens / Watt. Figuring 100W bulb = 1500 lumens... / 100 = 15W of LED. Your LEDs are 25mA * 4v = .1w each, so you would need 150 of them to equal a 100W light bulb. -- To counter the guy above me... You can actually run strings of LEDs on AC if you use a capacitor to limit the current and you have to have enough LEDs in series to make the voltage drop across the chain not blow out the individual LEDs. I believe they use this when they make LED christmas lights.

1. Wii remote controller lag problem with Samsung LED Series 7 7050 46 inch. anyone can help please?..?

i wud purchase a gamecube controller extremely it quite is like teh comparable cost, you are able to play any gamecube pastime with it and you may use it to do watevr the classic controller does ex. digital , mario console, destroy bros., mario kart and you cant play mairo galaxy with the two of thm yet it isnt even a stable pastime

2. 3D PLASMA / LED vs 3D PROJECTOR ?

I have found the best 3D effects from a good Plasma like the VT30 or VT50 series or samsungs Plasma E8000 with full HD 3D,the larger screen projectors use different technology and although the large screen is movie theater like in size and feel,the depth effects I always found better on Plasma.I have seen new Sony 4K and vidikron etc.All excellent but very expensive and the screen is as important as the quality of the projector.I have both panasonic & Samsung plasma & the effects are fantastic,and alot less expensive. There's a pro & con to every technology.Remember Im not saying a 3Dprojector is not great,just you need an expensive projector an expensive screen and a very dark room.I find that the blacks wash easily when any light reflects off the screen.

3. do 12v led bulbs require a minimum of 12v to work? would a 3.7v work? do i need 4, 3.7 batt for light to work?

Less that 12V should still work, but the bulb wo not be able to reach it's maximun brightness

4. Toggle between two colors in a common-cathode RGB LED using a SPST switch

If all you want is to have two different colours depending on whether a SPST switch is on, the simplest possible way is to have one on permanently and one switched, giving you either red or yellow. This answers the question as written. Trevor's answer would work to give one on or the other on (without mixing colours), which may be what you meant, however requires more complexity and components

5. can i wire my led power wire to the power wire of my car radio?

If it were me, I would just run a new power wire for the lights. The last thing you need is to get the L.E.D.s all hooked up and start blowing fuses on the radio. Your best bet is to find a new source. If you want to make it so the lights come on whenever the car is running, just find an ignition hot empty fuse slot in the fuse box. You can check this with a test light. This means that the wire will only get power when the key is to the on position

6. How can I go about making my headlights clear-cornered? Where can I find some LED turn signal bulbs?

Using BLUE lights are illegal .V LEDS has many options for led lights . On HID'S use 5000k or 4300k you need to stay in the white spectrum to be legal XENTEC are good brand

7. where can I get a 65 inch LED non 3D TV? (slim)?

check under the couch :)

8. Wiring LED driving lights powered from two separate switches and a common power source for two mode operation

Here's a way, using electromagnetic relays.Three relays have been shown.Actually a single 3PDT relay would suffice.Diodes have been avoided, considering the voltage drop they would cause.