Abstract:
The invention provides a luminescent lamp which comprises a tubular discharge vessel, a power source to maintain a discharge within the discharge vessel and a controller, arranged to control, during operation of the luminescent lamp, the power provided to the tubular discharge vessel by the power source. The lamp further comprises a luminescent material coating, having a coating surface with a coating surface area, coated on the tubular discharge vessel and an optionally optical filter, having a transmission for light emitted by the luminescent material, and having an optical filter area. One or more of(a) the luminescent material is arranged to show different luminescent colours over the coating surface area and (b) the optional optical filter is arranged to show different wavelength dependencies for the transmission over the optical filter area. By varying the power coupled into the discharge tube by means of the controller, the different luminescent materials are addressed (with concomitant different luminescences), respectively, and/or the different optical filters are addressed, respectively. This allows dimming of the luminescent lamp along the BBL.
Abstract:
An apparatus and a method for uni-directional and bi-directional transient blocking. The uni-directional apparatus has a depletion mode n-channel device at its input and a normally closed relay, e.g., a micro-electro-mechanical (MEM) relay, interconnected with the depletion mode n-channel device and the input in such a way that at a predetermined current value the transient causes the normally closed relay to switch into an open state and produces a bias voltage V n on the depletion mode n-channel device that is sufficiently high to switch it "off" and thus block the transient. An analogous arrangement at the output taking advantage of the same or a second relay renders the apparatus bi-directional. The structure of the apparatus and the method of operation ensure a reliable and repeatable trip current I trip and render the apparatus very robust and feasible for low-cost manufacture.
Abstract:
A lighting device includes at least one first electrically activated emitter, at least one lumiphor support element comprising a lumiphoric material spatially segregated from the first electrically activated emitter and arranged to receive at least a portion of emissions from the first electrically activated emitter, and at least one second electrically activated emitter disposed on or adjacent to the at least one lumiphor support element. First and second electrically activated emitters having different peak wavelengths may be in conductive with first and second device-scale heat sinks, respectively.
Abstract:
An apparatus and a method for uni-directional and bi-directional transient blocking. The uni-directional apparatus has a depletion mode n-channel device at its input and a normally closed relay, e.g., a micro-electro-mechanical (MEM) relay, interconnected with the depletion mode n-channel device and the input in such a way that at a predetermined current value the transient causes the normally closed relay to switch into an open state and produces a bias voltage V n on the depletion mode n-channel device that is sufficiently high to switch it "off" and thus block the transient. An analogous arrangement at the output taking advantage of the same or a second relay renders the apparatus bi-directional. The structure of the apparatus and the method of operation ensure a reliable and repeatable trip current I trip and render the apparatus very robust and feasible for low-cost manufacture.
Abstract:
A lighting device includes at least one first electrically activated emitter, at least one lumiphor support element comprising a lumiphoric material spatially segregated from the first electrically activated emitter and arranged to receive at least a portion of emissions from the first electrically activated emitter, and at least one second electrically activated emitter disposed on or adjacent to the at least one lumiphor support element. First and second electrically activated emitters having different peak wavelengths may be in conductive with first and second device-scale heat sinks, respectively.
Abstract:
The invention provides a luminescent lamp which comprises a tubular discharge vessel, a power source to maintain a discharge within the discharge vessel and a controller, arranged to control, during operation of the luminescent lamp, the power provided to the tubular discharge vessel by the power source. The lamp further comprises a luminescent material coating, having a coating surface with a coating surface area, coated on the tubular discharge vessel and an optionally optical filter, having a transmission for light emitted by the luminescent material, and having an optical filter area. One or more of(a) the luminescent material is arranged to show different luminescent colours over the coating surface area and (b) the optional optical filter is arranged to show different wavelength dependencies for the transmission over the optical filter area. By varying the power coupled into the discharge tube by means of the controller, the different luminescent materials are addressed (with concomitant different luminescences), respectively, and/or the different optical filters are addressed, respectively. This allows dimming of the luminescent lamp along the BBL.