First there are no one size fits all settings to do it. You have to play around.

You will need a dark room/place, your camera (DSLR), a flashlight or LED light, a tripod, some patience.

Pick a room with very little or no light (night time works if outdoors)
Turn the light on while setting up :)

Set the camera on a tripod and set it to manual exposure mode (M)
Set your ISO to 200 to start.
Set the shutter speed to 10 seconds
Set your aperture to around f/10

This is your base settings to start playing.

Set the item your wanting to play around with up on a table or prop it up. Set the camera up on the tripod and aim it at your item while the light is on.

Set sustom function 4 to "1" or turn off AF on the lens your choice.

*** a note on custom function 4, I turned off half press focus for the autofocus system over a year ago and I never looked back. on CF/4 1 and 3 turn your * button on the back of the camera into the Focus button, it takes a slight amount of time to get used to this but once you do.. well I love it.
***
Focus on the object with the light on by pressing the * button if you set CF/4 or half press shutter and then turn off AF on the lens.

Turn off the light.

Start the exposure by pressing the shutter. Shine your flashlight / led on the object. move the light around a bit if you like.

After the shutter closes examine the photo


Too bright?
Either stop the lens down a little (say from f/10 to f/11.. f/13 etc..) or you can lessen the time you shine light on the object.

Too dark?
You can open the aperture up some (f/8 f/5.6 etc) or lengthen the time you have the light on it. Lastly if its still too dark raise the ISO up making the sensor more sensitive to your light.

Give it another try..

If you need more time to work set a longer shutter speed. Remember in a dark room if you set 30 seconds on the shutter and dont turn on your flashlight or LED you will get a black photo, so shutter is only relevant to how much time you want to have to play with the light your "pouring" on the subject.


Oh and most of this is out of my head so if my base numbers are off, well just play around with them.
--
-Greg

http://www.gregknapp.net/
Equipment in Profile


Geek:
There are 10 types of people in this world.
Those who understand binary and those that dont.