Instructables
IMG-20121020-00017.jpg
IMG-20121020-00012.jpg
IMG-20121020-00015.jpg
Very Simple design - works for 110v AC as well as 220v AC. 

Only four components:

1. Bulb Base
2. 10 mm LED
3. 100 kilo ohm, 1 watt resistor (Brown, Black, Yellow)
4. 1N 4007 diode. 

Expected life - Atleast 5 years. 

Important: Attempt only if proficient in dealing with AC Mains.

DC Feature (Flashlight):

It also doubles as a flashlite, in case lights go out. Any cell, 3v, 6v, 9v or mobile battery can be used to make it a torch!!

Tips on connecting the wires:

1. First connect negative of diode to negative of LED, as high up as possible, near the base of LED. 
2. Then connect the resistor to the diode leg. 
3. Next, connect the positive of the diode to the positive of the LED, but as low as possible toward the tip of the leg. 
4. That way, both the legs of the final product will be almost of equal length. 
5. No soldering was done and so no allergies or waste of time, in my project. 
bhvm8 months ago
Ketan,
Would an 700mA or 350mA Power LED work in your circuit. I see that the resistor is wasting the bulk of energy by converting it to heat, so power LEDs could tip the balance in favour?
Thanks.
pandyaketan (author)  bhvm8 months ago
For one watt led circuit, i had found a good one, as below:

http://vineetron.blogspot.in/2012/10/230v-to-1-watt-led-driver.html

Yes, my circuit is for demo purpose, as to how a single led can be on AC mains, with minimum components....

Thanks for pointing out, others may have similar queries...

reg
ketan
KoolVineet1 year ago
Hi, been searching for AC powered LED for some time...This seems simple solution.
but I have some questions...have you tested this for long period of time? Do the parts heat up? any chance my bulb holder will melt if I connect it and use it as regular light source?
Thanks for post.
Oh, and if I want to add multiple LEDs, will just connecting them in series work?
pandyaketan (author)  KoolVineet1 year ago
1. Yes, tested for avg 8 hrs per days, for many months.
2. Yes, parts (resistor) heats up. So never use a 1/2 or 1/4 watt resistor. Only 1 watt, 2 watt or 3 watt rated resistor. I have used 22 kilo ohm, 1 watt resistor and it 'does' heat up.
3. No, bulb holders will not 'melt' - they are rated for 1 Amp & up... ;-)
4. Yes, you can connect them in series.

Still, i suggest you take your time and get expert help.

Your competence should meet your aspirations, before you attempt anything on AC Mains - my humble suggestion to all aspirants!
reg
ketan
what is the diode for?
pandyaketan (author)  amandaghassaei1 year ago
Diode stops reverse current as well as does half wave rectification of AC Mains.

reg
ketan
--------
"May the good belong to all the people in the world.
May the rulers go by the path of justice.
May the best of men and their source always prove to be a blessing.
May all the world rejoice in happiness.
May rain come in time and plentifulness be on Earth.
May this world be free from suffering and the noble ones be free from fears"
---- Vedic blessing