Is it possible to make your own LED powered lamp or flashlight?

Each led requires 1.7 to 2.2V,depending on colour.

But blue and white need 3.5v each.See 2nd Link fig 7.

What 'batteries' do you want to use. to use?

What container or housing will be used?

Is a reflector required, if so, how can several

LEDs be placed a the focus?

Allow space for switch, and wiring.

How are connections to be made to

'batteries'?

For a multi LED flashlight, operating at

low voltage. a control circuit will be required.

Your challenge as a designer is to best

accomodate the above conditions.

Hint. Get a faulty mobile phone, with a good

3.5 to 3.7V battery and charger. Remove all

the electronics bar the wiring between the

charging connections and the battery. Fit a

small slide switch. Mount the LEDs inline,

but recessed along the top of the phone

case.

Construct a control circuit as Fig 8 at 2nd Link.

Hook up a battery to some LEDs. Pretty simple. You're probably going to want to add in some resistors too to make sure the LEDs don't get destroyed.

Yes this is possible. You can connect your LED's in series, meaning your battery will go to the positive terminal of one, then the negative terminal will go to the positive terminal of the next and so on and so on until the last terminal, which will go back to the battery ground.

Depending on the voltage of the battery, you can vary the number of LED's

for an AC~ powered you would want a step-down transformer, a rectifier, a filter capacitor a resistor a switch and the LED's.