Emergency lighting equipment includes: First, the light […]
Emergency lighting equipment includes:
First, the light source
F. The lamp consists of six parts.
1) Light sources include:
One. Incandescent lamps have been basically eliminated in emergency lighting due to their short life and high power consumption, but they are still used in some maintenance-free double-headed emergency lamps.
b. Fluorescent lamps are often used for emergency lighting. In the past, low-power fluorescent lamps were also used for some emergency evacuation signs. Due to other factors such as light attenuation life, a new type of electroluminescent film is gradually replaced.
C. Electroluminescent film: This is a new type of luminescent material, which is made by using a suitable solid to interact with an electric field to emit light. The electroluminescent film can freely change its thickness and shape, and does not generate heat during the light emission process. Brightness can vary with voltage and frequency. It has a service life of more than 5000 hours and can work in harsh environments. With its wide temperature range (-30 ° C to + 60 ° C) and low power consumption, it has received increasing attention and use. In emergency signs, consider replacing incandescent and small fluorescent lamps and other light-emitting devices. Ideal luminescent material.
d. LEd light-emitting diodes; light-emitting diodes are considered new light-emitting elements. Thanks to their strong light, long lifespan and high brightness of more than 50,000 hours, they will have a bright future in emergency signage and lighting. However, due to its high cost and low power, it has not been widely used today.
There are two types of emergency lighting power batteries, two types of lead-acid batteries and nickel-cadmium batteries.
Lead-acid batteries are inexpensive and have been widely used in previous emergency signs and lighting. Lead-acid batteries have a poor shape, heavy weight, short life, and limited life due to the internal heat dissipation conditions of the lamp. As for the impact, the current national standard does not allow lead-acid batteries to be used for fire emergency lights with built-in power sources, but only for centralized power supply emergency lights. Currently, only self-powered emergency luminaires are allowed to seal maintenance-free nickel-cadmium or nickel-metal hydride batteries. Although nickel-cadmium batteries are more expensive than lead-acid batteries, they have a long life, can be charged more than 1,000 times, and are more environmentally friendly.
3) Emergency converter:
The role of the emergency converter is to convert the low-voltage DC power provided by the battery into AC power high enough to make the light bulb start smoothly and work normally. At present, all emergency converters use crystal devices to repeatedly make the primary winding of a DC-powered transformer. Turn on and off to get AC voltage to get the higher voltage required for lamp operation from the secondary of the transformer. In order to reduce the size of the transformer and avoid audio noise problems, and use fluorescent lamps at high frequencies to improve work efficiency, the operating frequency of inverter equipment is usually above 20KHZ.
Linsheng is a China Emergency Light Manufacturers , producing high quality emergency light products. Shop for buying reliable quality emergency light products, welcome to visit us: https://www.linsheng.com