(1) Production and distribution licenses must be issued by the Regional Bureau of Public Security Technical Protection Management Office.
(2) The production and distribution of anti-theft doors must be qualified by the product quality supervision and inspection stations authorized by the regional technical supervision bureaus and public security bureaus according to law.
Second, the public safety industry standard of the People's Republic of China GA25-92 "General technical conditions for anti-theft security inspection doors" is the only basis for the production and detection of security doors. Qualified security doors should have the following features:
(1) The net work time is 15 minutes by professionals using ordinary mechanical hand tools and portable power tools. The 615 square centimeters of openings cannot be penetrated at the weakest part of the door.
(2) The door body should withstand 9 shocks with a 30-kg sand bag without breaking, that is, it can prevent forced entry into the room.
(3) The hinges should be able to withstand the destruction of hand tools.
(4) The door lock shall be equipped with the three-position qualified locks recommended by the Ministry of Public Security. Good security doors generally use three-dimensional locks, six hinges, doors and windows, and concealed locks. Even if they are cut off at the same time, the doors cannot be opened. Some certified production companies have passed the test although the sample structure has passed the test. However, when it comes to mass production, they cut corners and cut materials, and used some unfair means to profit. Many mobile users selling street doors and counterfeit security doors have a thin material, small hinges, poor welding quality, large spacing, simple locks, and no anti-theft performance.
Security Doors and Windows Room Windows
PPF (luminous flux density) is an indicator used to measure the light energy output of plant lamps, indicating the flow of light energy through a unit area in a unit time. The higher the PPF, the following effects on plant lights:
1. Provide more adequate light energy: high PPF means that plant lamps can output more light energy, which is very important for plant photosynthesis. Photosynthesis is a key process for plant nutrient synthesis and growth, and high PPF can provide more adequate light energy and promote the efficiency of plant photosynthesis, thus promoting plant growth and development.
2. Promote the photosynthesis efficiency of plants: plant lamps with high PPF can provide more intense light, so that the chlorophyll on the leaves of the plants can absorb light energy more fully, thus improving the efficiency of photosynthesis. The improvement of photosynthesis efficiency can increase the nutrient synthesis capacity of plants and promote the growth and development of plants.
3. Increase the yield and quality of plants: high-PPF plant lamps can provide more intense light and promote the growth rate and yield of plants. In agricultural production, the use of high-PPF plant lamps can increase the yield of crops, and the quality of crops may also be improved due to the increase in light intensity.
for indoor led grow light full spectrum,led grow light small,led grow light from china blue red grow light bar
Shenzhen Pvison Technology Co., Ltd. , https://www.pvisunggrowlight.com