Abstract: A plant propagation module has an outer layer and an inner layer. The outer layer is permeable to water and air. The inner layer is disposed within the outer layer such that the outer layer surrounds the inner layer. The inner layer forms an inner cavity and is substantially impermeable to water. Growth matrix and one or more plant propagants are positioned within the inner cavity. Each of the inner layer and the outer layer are degradable, with the inner layer degrading faster that the outer layer to permit water and air to access the growth matrix and the one or more plant propagants.

Abstract: A luminaire and retaining device that retains LEDs in a housing of the luminaire through the use of a mechanical interface with the housing. The retaining device has a shape that engages the housing through a ratcheting feature, and allows the LEDs and retaining device to be removably installed in such a way that manufacturing time is reduced. This provides for easy of replacement or servicing of the LEDs.