Tri-color lamp is a kind of lamp that can realize the effect of changing three different colors in one lamp, which is more common in new lamps now. Usually white light source, warm yellow light source and other colors (such as pink) light source can be changed, which is very common in the installation of household lamps.

The larger the space, the larger the lighting area. In order to avoid the dark corner caused by insufficient light intensity, the power and size of the corresponding ceiling lamp should be higher. The smaller the space, the smaller the lighting area, the concentrated reflected light from the wall, and the ceiling lamp with small power and small volume can meet the demand.

The railway signalman is introduced as follows:

In the early railway transportation system, in order to ensure the safety of trains, effective signal control is needed. Railway signalmen use hand-held tricolor lights to instruct train drivers to move, slow down or stop through different color light signals.

The red light signal indicates stopping and instructs the train driver to stop; The green light signal indicates that the train driver can move on; The yellow light signal indicates that the train driver needs to slow down or be vigilant. The railway signalman will change the light signal according to the train operation and the requirements of the signal system to ensure the safe operation of the train and prevent accidents.

With the development of science and technology, the railway signal system has gradually realized automation, replacing the manual signalman. However, tricolor lamp is still a symbolic signal element and is widely used in railway traffic.

In order to meet the needs of the future development of the railway industry, following the principle of "market-oriented, capacity-oriented" and aiming at cultivating front-line technical personnel engaged in the production, construction and maintenance of railway signal technology and equipment, the training scheme for applied talents of railway signal specialty is determined. Therefore, the railway signal specialty has a broad development prospect and a very broad employment market.

This major trains applied secondary specialized technical personnel with basic knowledge and skills of railway signal equipment construction, operation, detection, analysis and fault handling.