PIC controlled LED torch

In spite of their higher price, white l.e.d.s are increasingly being used in lighting applications. There are many advantages to using them, such as longevity, output, solidity, compactness, etc. A majority of commercial l.e.d.-based lamps now use white “high luminosity” l.e.d.s, and the recently introduced “super power l.e.d.” family is increasingly finding favour. It is one of the latter that is used here, the Lumileds Luxeon Star/O. This l.e.d. can deliver a luminous power equivalent to 20 white high intensity 5mm l.e.d.s. Its integrated optics allow the production of a very narrow beam.