Progressive frost in a luminaire

A luminaire, comprising:

• a light source configured to generate an emitted light beam;
• and
• a diffusion wheel subsystem, comprising:
• a first diffusion wheel configured to provide different degrees of diffusion to a light beam passing therethrough, wherein a first diffusion region of the first diffusion wheel provides a lowest degree of diffusion, and wherein the first diffusion region of the first diffusion wheel is located at a first edge of the first diffusion wheel;
• and
• a second diffusion wheel stacked with the first diffusion wheel and configured to provide different degrees of diffusion to a light beam passing therethrough, wherein a first diffusion region of the second diffusion wheel provides a degree of diffusion approximately equal to that of the first diffusion region of the first diffusion wheel, wherein the first diffusion region of the second diffusion wheel is located at a second edge of the second diffusion wheel, and wherein the second edge of the second diffusion wheel is an opposite edge relative to the first edge of the first diffusion wheel,
• wherein the diffusion wheel subsystem is configured to be in a retracted configuration in which the first and second diffusion wheels are positioned out of the emitted light beam,
• wherein the diffusion wheel subsystem is configured to be in an initial configuration in which the first diffusion region of the first diffusion wheel is radially adjacent in the emitted light beam to the first diffusion region of the second diffusion wheel, and in which at least one of the first diffusion regions of the first and second diffusion wheels is positioned in the emitted light beam,
• wherein the first diffusion wheel and the second diffusion wheel are configured to rotate in opposite directions to transition from the retracted configuration to the initial configuration,
• wherein the diffusion wheel subsystem is configured to be in a rotated configuration relative to the initial configuration in which one or more of the diffusion regions of the first diffusion wheel or of the second diffusion wheel are in the emitted light beam, and
• wherein the first diffusion wheel and the second diffusion wheel are configured to rotate in a same direction to transition from the initial configuration to the rotated configuration.