Regarding the differences between engineering lamps and non-standard engineering lamps

Engineering lamps: Broadly speaking, lamps produced on a custom basis are considered engineering lamps. In the industry, lamps that fall outside the basic category of household lighting are generally classified as engineering lamps. Engineering lamps have no restrictions on size or materials. 

Engineering lighting fixtures refer to customized lighting products suitable for specific projects based on their actual needs, serving both decorative purposes and are also known as non-standard lighting fixtures, decorative lighting fixtures, or customized lighting fixtures. They usually include hotel engineering lighting fixtures, non-standard lighting fixtures, clubhouse lighting fixtures, KTV lighting fixtures, villa lighting fixtures, model room lighting fixtures, lobby lighting fixtures, and outdoor lighting fixtures, among others. 

"Non-standard" means "not made according to a standard".

For ordinary products, in order to be compatible with other products (this is for the convenience of use and maintenance), they all have their own manufacturing standards. For example, the "screws" we commonly use must be standard parts. If you go to any store and buy screws of the same specification, they will be interchangeable. 

"Standards" come in various forms such as national standards, local standards, and industry standards, which complement each other. 

"Non-standard" goods or parts refer to those that are rarely used, or are specially made for a particular item. As a result, it is difficult to obtain general or substitute products for them. 

Sometimes, "non-standard" items are designed this way intentionally, with the aim of safeguarding the independence of their production and maintenance. 

The quality of this product is mediocre, the materials are not of high quality. However, it has the advantage of a lower price. Standard engineering lamps are targeted at the general public and should focus on quality to gain an advantage. Otherwise, they won't be able to enter the market. The price is slightly higher than that of engineering lamps.