A detection executing method comprises: a current control chip initially configuring all ports in a strong pull-down mode, so as to initiate detection procedures as follows; the current control chip detecting a level status of each port thereof, and when detecting a port with a high level status, identifying the port as an upstream port electrically connected with an upstream control chip in the communication link, and configuring other ports to be in a weak pull-up mode; the current control chip detecting the level status of each of the other ports, and when detecting a port with a low level status, identifying the port as a downstream port electrically connected with a downstream control chip in the communication link; the current control chip outputting a high level through the downstream port thereof, for driving the downstream control chip connected with the downstream port to execute the same detection procedures.

An optically transmissive component comprises a light scattering extension portion which can be used within an edgelit light fixture to provides benefits in brightness uniformity and visual appearance by scattering light from near an input edge of a light guide or other edgelit optical element. The sequential propagation of light through both the extension portion and main portion of the optically transmissive component significantly reduces the higher brightness and uneven hotspotting type visual defects typically produced near the input edge of an edgelit optical system. With appearance constraints removed or reduced, edgelit light fixtures with higher output, higher efficacy, and/or simplified edgelit optical components are enabled. Embodiments include the use of the extension portion of the optically transmissive component extension to mechanically position and retain an edgelit optical element within a light fixture.

A light emitting device with an adjustable optical angle includes a base, a light source, and a panel. One of the light source or the panel is movably mounted on the base. The light source includes a plurality of light emitting matrices. The panel includes a plurality of first transmission areas. A distance between two adjacent light emitting matrices is equal to a distance between two adjacent first transmission areas. The panel includes one or more second transmission areas respectively disposed between the two adjacent first transmission areas. The plurality of first transmission areas and the one or more second transmission areas have different transmission angles. The one of the light source or the panel is configured to be moved to enable a light emitting area of the light source to be located to correspond to the plurality of first transmission areas or the one or more second transmission areas.

A panel lamp comprise a lamp housing, a light emitting assembly disposed inside the lamp housing, a lampshade having a top surface disposed under the lamp housing, the lamp housing comprises a roof and a circle of peripheral wall extending downward from an edge of the roof, the lamp housing has a first connecting plate extending outward from an edge of the peripheral wall, the lampshade has a fourth connecting plate extending inward from an edge of the lampshade, and, an accommodating space is defined between the fourth connecting plate and the top surface of the lampshade for the first connecting plate of the lamp housing positioned and located within. The panel lamp of the present invention does not require the additional frame, The lamp housing and the lampshade are directly limited and connected, which simplifies the structure of the panel lamp. In addition, the lampshade is bent and deformed to be clamped with the lamp housing, so the both are connected firmly.