Patent ID: 8870412
Filing Date: 2014-10-28
Classification: B60Q,F21K,F21S,F21V,F21Y,H01L,H05B,Y02B

Abstract:
1. A replacement light tube for replacing a fluorescent light tube, comprising: an elongate tubular housing having a first end and a second end; a first end cap and a second end cap disposed on the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a rigid support structure enclosed within the elongate tubular housing and having a planar portion having a first surface extending within the elongate tubular housing between the first end and the second end, the rigid support structure having spaced-apart sidewalls extending away from the first surface and extending within the elongate tubular housing between the first end and the second end, at least a portion of the sidewalls in contact with an interior surface of the elongate tubular housing; a plurality of light emitting diodes supported by a second surface of the planar portion opposite to the first surface and between the first end and the second end, the plurality of light emitting diodes arranged to emit light through the elongate tubular housing; and a power supply circuit including a pulse width modulator and at least two current limiting elements, the at least two current limiting elements configured to receive power from the pulse width modulator and to transmit power to at least some of the plurality of light emitting diodes.