One kind is the full-automatic plant lamp that can provide the low cost micro computer control of the appropriate illumination of houseplant without man-computer interface, includes a variable directional photosensitive device, a microcomputer controller, and an at least light emitting device. The variable directional photosensitive device can be adjusted the external light source for being directed toward and being intended to sense, perceive its light and shade, and signal is sent to the microcomputer controller, microcomputer controller light application time according to needed for external light source light and shade and calculating plant, to determine when to open light emitting device to provide plant appropriate illumination. The built-in intelligent software of the micro computer control utensil, is not required to manual operation completely, mankind's work and rest rule can be calculated according to external light and shade situation, and determine the illumination opportunity for not influencing mankind's sleep as far as possible accordingly.一種無需人機介面即可提供室內植物妥善光照之低成本微電腦控制之全自動植物燈，包含一可變指向性感光裝置，一微電腦控制器，及至少一發光裝置。該可變指向性感光裝置可被調整指向所欲感測之外部光源，感知其明暗，並將訊號傳送至該微電腦控制器，該微電腦控制器根據外部光源明暗及計算植物所需光照時間，以決定何時開啟發光裝置以提供植物適當之光照。該微電腦控制器具內建智能軟體，完全不需人工操作，即可根據外部明暗狀況計算出人類作息規律，並據此決定儘可能不影響人類睡眠的光照時機。
