Summary #

This article covers two functions that automatically adjust lighting intensity over time based on different triggers: Acclimation gradually ramps brightness up or down over a defined period of days — useful when introducing new corals or plants to an existing lighting program — while Temperature-Dependent Light Reduction reduces or switches off lighting when a temperature sensor reports that the nominal temperature has been exceeded, helping prevent the lights from adding unnecessary heat on warm days.

Applies to #

• Mitras Lightbar 1-3
• Mitras Slimline
• Mitras LX8 Series
• Mitras LX7 Series (incl. Industrial Line / IL)
• Mitras LX6 Series
• Compatible controller:
  • ProfiLux 4 Series (incl. Industrial Line / IL)
  • ProfiLux 3 Series
  • ProfiLux Mini / Light (all versions)
• Software:
  • GHL Connect (App, Webinterface, myGHL)
  • GHL Control Center

Acclimation #

Acclimation scales the brightness of all dimmable channels simultaneously over a defined period, interpolating a daily factor between a start and end intensity. It applies to every dimmable channel automatically. Open it via Illumination → Acclimation.

• Active: Enables or disables the acclimation period.
• Start – Date / Intensity: The period begins on this date, with all dimmable channels scaled to this percentage of their normal brightness.
• End – Date / Intensity: The period ends on this date, at this percentage.

A daily scaling factor is calculated between the two — for example, starting at 40% and ending at 100% over five days results in 40%, 55%, 70%, 85%, and 100% on consecutive days. The same mechanism works in reverse for gradually dimming down. A chart at the bottom visualizes the resulting intensity curve over the chosen period.

Temperature-Dependent Light Reduction #

This function reduces or switches off lighting when a temperature sensor reports that the water is too warm, preventing the lights from adding unnecessary heat. All values are relative to the nominal temperature set for the chosen sensor — not absolute temperature thresholds. It must be enabled per Illumination channel — see the Channel Settings section of the Lighting Schedules article. Open the global parameters via Illumination → Temp.-dep. lightred.

• Determining temperature probe: Selects which connected temperature sensor drives the reduction.

The behavior then differs depending on whether a channel is dimmable or not:

Dimmable Channels #

• Min. temperature excess: How much the nominal temperature must be exceeded before reduction begins. Below this value, lighting runs at full intensity.
• Max. temperature excess: How much the nominal temperature must be exceeded for the channel to be switched off completely. Between the two thresholds, brightness is reduced proportionally along a ramp.

For example, with a nominal temperature of 26 °C, a minimum excess of 2 °C, and a maximum excess of 4 °C: at 28 °C reduction begins, at 29 °C brightness is already reduced by 50%, and at 30 °C the channel switches off completely.

Non-Dimmable Channels #

• Shut off limit: How much the nominal temperature must be exceeded before the channel is switched off.

Once switched off this way, the channel does not come back on when the temperature drops — it only switches on again when the next scheduled on-time in its illumination curve is reached. This is intentional behavior, particularly for gas discharge lamps that shouldn’t be switched on and off continuously.

Notes #

• For temperature-dependent light reduction, make sure the nominal temperature for the chosen sensor is correctly configured — all excess thresholds are calculated relative to that value.