When setting up your print viewing area, you may want to measure the
light that is emitting from your SoLux bulbs to check it is at a correct
level. This isn't as straight forward as it may seem, as light mix
measurement is quite complex. Most regular transformers are in fact not
very good at outputting precisely 12 volts (varying between 11 and 13V),
which causes some change in colour temperature. We recommend a high
quality electronically regulated 12V transformer is used if possible.
Other factors may affect your Kelvin light reading as well, like the
colour of your walls, any light escaping from the back of the bulb and
being reflected by your fitting (black backed bulbs are designed to
solve this issue and thus tend to be more accurate), the colour of your
In our own testing, SoLux bulbs emit light around +- 300K from their
stated light temperature when driven at precisely 12V and measured at
the lamp itself.
Even if you measure a somewhat different Kelvin temperature, the CRI
(Colour Rendering Index) and overall spectral output of these globes
remains unmatched by any other affordable lighting option and are an
excellent match to D50/daylight without weird spectral spikes like
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