Every fluorescent substance has its own specific way to react to ultraviolet stimulation, whose intensity varies according to the current density flowing into the lamp. We show the changing of the luminous flow as the mA current changes in a graph.
On this premise, though rather approximately, it is possible to extrapolate the luminous flow’s values in tubes with different diameter by applying to them the relation displayed by the following graphs, where the luminosity of the 15mm diameter tube has conventionally been standardised to 1.
The graphs indicate, for every single diameter and power intensity, a value to be multiplied by the value of the lumen per meter of the 15mm standard having the same power intensity. This value is given on the color cards.
Example:
how to calculate the value in lumen per meter of a tube aving color #14, 12mm diameter and 25 mA. First of all, open the color card clicking either on the specifier or on #14 in the blue color area of the chromaticity diagram. The luminous flow graph shows a luminosity of about 345 lumen per meter at 25 mA. Multiply this value by 1.095 (as shown in the following graph – green line at 25 mA). A value of 378 lumen is thus approximately obtained.
The graphic below is applicable to lamps internally coated with fluorescent materials and filled with blue gas mix with mercury
Fluorescent tubes (where the light is primarily emitted by the fluorescent powders that coat the tubes)
The graphic below is applicable to lamps filled with pure gas neon (coated and ancoated)
Luminescent neon tubes (where the light is emitted by the luminescent discharge in neon gas and can partially be modified by the filtering power of the glass or of the powders):
The graphic below is applicable to ancoted lamps filled with blue gas mix with mercury
Mercury vapor luminescent tubes (where the light is emitted by the luminescent discharge and can be modified by the filtering power of the glass or, in the case of lead glass, by the very low fluorescence of the glass itself)
Introduction to the color cards
The following presentation will explain, as completely as possible, the various aspects concerning the luminous tubes offered by TecnoLux. For this reason we have chosen a graphic display that will make the comparison between light sources easier. For instance, we generally avoided the modification of the diagram scale, a few cases excepted. One of these is that of the luminous flow for tubes with low luminosity, where we had to show the maximum value at 250 lumen instead of 2250 to make the representation readable.
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