Colour Temperature Conversion Filters

The principle on which those filters work is the "modulation" of the emission spectrum of the light source.
Starting from a lighting source the dichroic filter is done to let some wavelenght of the spectrum passing through unfiltered and some, instead, blocked or diminished in flow intensity.

With the ODL Hot Light temperature conversion dichroic filter it is possible to get a "warmer" light by passing for instance from 4200K to 3000K to light bread and oven products. The typical temperature of a tungsten lamp (3000K) with a great percentage of red in its spectrum, exalts the brownish colour od the bread and oven products.

By putting a Cold Light temperature conversion dichroic filter in front of a lighting source, it is possible to obtain a "colder" feeling of the light by raising the Tc of the emitted spectrum, f.ex. from Tc=4200K to Tc=5500K. The sun at noon (Tc=5500K) with its high percentage of blue is considered the "natural" light to light textiles and jewellery.

The ODL Special Light filters are proposed in two different types to exalt the colours of the goods that have a rose/red dominant or a green dominant.

In the former type, the filter coupled with the light, is used to light meat, salami, ham, red fruit, etc.

In the latter type, the filter coupled with the source, is used to light green grocery, vegetables, beans, peas, and any kind of food with a green dominant in their colour.

As all the ODL dichroics , the colour temperature conversion filters and special light filters have the following characteristics

  • chemical inertness to several aggressive environments
  • high level of temperature range: up to 400°C (with the borosilicate substrate)
  • no radiation absorption
  • no temperature shift of the chromatic coordinates
  • long term stability of the optical characteristics.