Provided are a light controller capable of efficiently extracting light by suppressing attenuation by means of controlling light, a lamp, a lighting device, and a plant cultivation apparatus that uses the lighting device. The lighting device (10) is provided with a light bulb-type lamp (20) and a device body (30) into which a cap (211) of the lamp (20) is inserted. The lamp (20) is provided with a lamp body (21) on which the cap (211) is formed, and a globe (22) mounted on the lamp body (21). The globe (22) is a spherical bulb and functions as a light controller. The globe (22) is provided with a transparent member that serves as protective cover, and a light-controlling layer that is formed on the light-emitting element side (inside) of the transparent member. The light-controlling layer is provided with, in order in the light-emitting direction from the light-emitting element (213), a fluorescent coating layer that is excited by the light from the light-emitting element (213) and emits light that has undergone wavelength conversion, a phosphorescent coating layer that stores light from the light-emitting element (213) and emits light, and a diffusion coating layer that diffuses the light from the light-emitting element (213).Linvention concerne un dispositif de commande de lumière permettant lextraction efficace de lumière en supprimant latténuation au moyen dune commande de lumière, une lampe, un dispositif déclairage et un appareil de culture de plantes qui utilise le dispositif déclairage. Le dispositif déclairage (10) comprend une lampe du type à ampoule (20) et un corps de dispositif (30) dans lequel un culot (211) de la lampe (20) est introduit. La lampe (20) comprend un corps de lampe (21) sur lequel le culot (211) est formé, et un globe (22) monté sur le corps de lampe (21). Le globe (22) est une ampoule sphérique et fonctionne comme un dispositif de commande de lumière. Le globe (22) comprend un élément transparent qui sert de couvercle de protection et u
