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Forum: Flashes, Lighting, and Studio
01-23-2016, 05:18 AM
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No, you are not mistaken. LEDs can be made to illuminate over a small range of different currents, however it is quite a small range between the light being just visible and burning out completely.
Using a potentiometer as in the link will enable you to vary it over this range but there are many problems.
The effect will vary wildy with battery voltage so although the chosen value of potentiomer will work when the battery is fresh then it wouldn't work once the battery starts to age.
The variation in brightness will not be linear and will probably not cover a large enough light difference to make it useful for photography.
The largest problem is that the colour temperature of the light will vary dramatically at different current settings.
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