SoLux bulbs are available in several different color temperatures. For digital photography, Solux bulbs are perfect, yielding accurate rendition of difficult to photograph minerals like dioptase and azurite. They are 12 volt bulbs and fit in any light fixture that can accept an MR-16. Solux also manufacturers a task light to hold Solux bulbs with highly adjustable swivel arm that works well in photography, display or even illuminating specimens under a microscope. Even in conventional 35-mm photography color balance, exposure adjustments, and contrast control are manipulated to produce a satisfactory image by the photo processor.
Digital camera built-in exposure meters try to balance the image exposure to produce a medium value.
This works well when the subject is a medium value - like skin tones. But if you are photographing a dark mineral like azurite, the camera will lighten the exposure in an attempt to yield a medium value, making the image overexposed. If you are shooting a bright white subject like okenite, the camera will attempt to darken the exposure to yield a medium value, making the image underexposed. Similar problems occur with color balance. This works well with a normal subject.