Abstract: A lighting apparatus includes a light source, a silicon controlled rectifier, a rectifier and a current source circuit. The light source has multiple LED modules with different light parameters. The silicon controlled rectifier filters a filtering ratio of an input AC power to a filtered AC power. The filtering ratio is associated with a control angle by supplying a control voltage to the silicon controlled rectifier. The maintainer circuit maintains a working current to the silicon controlled rectifier even when the control angle is large causing the volume of the filtered AC power less than a threshold. The current source circuit receives the DC power. The current source circuit has a wall switch input for connecting to a wall switch. An on-off input pattern of the wall switch is detected by the current source circuit for generating multiple corresponding driving currents.

Abstract: A lighting apparatus includes a light source, a silicon controlled rectifier, a rectifier and a current source circuit. The light source has multiple LED modules with different light parameters. The silicon controlled rectifier filters a filtering ratio of an input AC power to a filtered AC power. The filtering ratio is associated with a control angle by supplying a control voltage to the silicon controlled rectifier. The maintainer circuit maintains a working current to the silicon controlled rectifier even when the control angle is large causing the volume of the filtered AC power less than a threshold. The current source circuit receives the DC power. The current source circuit has a wall switch input for connecting to a wall switch. An on-off input pattern of the wall switch is detected by the current source circuit for generating multiple corresponding driving currents.

Abstract: A dust-proof device for machine tool worktable comprises a worktable, a worktable base, a stainless steel dust cover, organ-type dust covers and L-shaped dust-proof plates. The worktable base is installed on a machine tool bridge. The upper portion of the worktable base is provided with a U-shaped through groove. Two ends of the stainless steel dust cover are sealed by the L-shaped dust-proof plates. The upper portion of each L-shaped dust-proof plate is fixed on the lower side of the stainless steel dust cover, and the lower portion of the L-shaped dust-proof plate is fixed on the machine tool bridge. Each organ-type dust cover is disposed under the stainless steel dust cover and has one end connected to the worktable base and the other end connected to the L-shaped dust-proof plate. The worktable covers the stainless steel dust cover and is connected to the worktable base by means of bolts.