| 摘要 |
PROBLEM TO BE SOLVED: To improve the effect of infrared remote control by the directional angle of a light receiving element. SOLUTION: This luminaire is provided with a fluorescent lamp 2, the light receiving element 3 for receiving an infrared remote control signal (wavelength ≈945 nm) Ir, and an optical filter 4 located in front of the element 3 and having a band-pass characteristic that the permeable peak wavelength λ is around 965 nm in the case of the incident angle θ=0 deg.. In this case, the half-value angle of the element 3 is set within around 35 deg.. When a directional characteristic is improved by retreating the position of the chip 10 of the element 3 from a lens 11, and its half-value angle is set within around 35 deg., the cut-off rate of an argon spectrum Ar is doubled or more, and the effect of the remote control in the low-temperature lighting initial period of the fluorescent lamp 2 is clearly improved. |
