Shedding New Light on Darkroom Illumination

Light-Emitting Diodes
<<Previous | Thumbnails | Next>>

Despite this drawback, they have many advantages that make them especially attractive for darkroom lighting. LEDs have very low power consumption and operate on low voltage, making them useful in wet areas or in battery-operated lights. Light output is easily controlled with a current-limiting resistor or potentiometer, which can be made tamper-proof.

Although the spectral output is not narrow, it does not change during the operating life, and there are no filters to fade or maintain. LEDs are robust devices, with extremely long life and low maintenance requirements.

As point light sources with an emitting surface about the size of the head of a pin, LEDs are ideally suited to path lighting, which will be discussed later in this paper. The light emitted can be either diffused or focused, as needed. Most important, LEDs have an instant off/on response, making them the best choice for task lighting, which can greatly reduce unwanted exposure of the film.

Slide 34 of 79