| 摘要 |
Device (2) has light source (12) of illumination modules (16) adapted to illuminate field zones (30). Illuminated zones (30) are with the overlap zones (32), and each module (16) defines overlap volume (42). Device has detector (24) for zone of lower illumination in overlap zone, and control means including the control units (18) associated with the modules (16) and a central unit (22) for increasing luminous flux of respective module when zone of lower illumination is detected. The light source (12) is adapted for illuminating the overlap zone (32) with a determined illumination, and the control means (18,22) are adapted to increase the luminous flux of the second module (16) so to have the illumination of the overlap zone equal to the determined illumination. The detector (24) is adapted for detecting a shadow zone which is created by an obstacle in the overlap volume, and the control means (18,22) are adapted so to increase the luminous flux of the second module to a determined rate, which is equal to the ratio of the surface of the shadow zone to the surface of the overlap zone. The central unit (22) comprises means for decreasing the luminous flux of the first module (16) when the zone of lower illumination is detected. The modules (16) are adapted for emitting light of the same spectral composition. The module (16) comprises one or more light-emitting diodes (LEDs), where at least two diodes are adapted to emit the light of different colors. For example, each module (16) comprises 3 red, 2 green, 1 orange, and 3 white LEDs that is in the ratio 3:2:1:3. The control unit (18) is adapted for adjusting the luminous flux of each LED of the module (16) as a function of a consigned value representing a color and an intensity. Each control unit (18) is connected to the central unit (22) so to receive the consigned values. The module (16) also comprises means for detecting a defective LED, and means for compensating the defect of LED. The compensation means are adapted for decreasing the luminous flux of LEDs which emit the light of color different from that of the defective LED, or are adapted for increasing the luminous flux of LEDs having the same color as the defective LEDs. The color return index (CRI) of the light source (12) is at least 90, so to have the color of tissue close to realistic. |
