Manual frost mechanism

A luminaire comprising:

• a light source configured to emit a light beam;
• a frost filter mechanism mechanically coupled to a lens group of the luminaire and configured to move with the lens group along an optical axis of the light beam, wherein the frost filter mechanism comprises:
• a frost filter configured to be moved from a first position outside of the light beam to a second position in the light beam;
• and
• a toggle control coupled to the frost filter and configured to:
• rotate the frost filter from the first position to the second position when the toggle control is rotated in a first direction;
• and
• rotate the frost filter from the second position to the first position when the toggle control is rotated in a second direction;
• wherein the toggle control is configured to operate as an over-center mechanism configured to:
• resist rotation of the toggle control in the first direction when the frost filter is in the first position;
• and
• resist rotation of the toggle control in the second direction when the frost filter is in the second position;
• and
• wherein the toggle control comprises a spring mechanically coupled at a first end to the toggle control and at a second end to a feature mounted in a fixed position relative to an axis of rotation of the toggle control.