Contact Supplier Request a quote. High-pressure sodium-vapour (HPS) lamps have an inner discharge tube made of translucent alumina that can withstand the corrosive effects of a mixture of mercury and sodium under greater pressure and higher temperature. Introduction. Conversely, in landscaping applications, they make plants and trees look extremely rich and vibrant, as they bring out the green color of foliage beautifully. An ele… No. The disadvantage is they do not flatter the human skin color thereby making them not an ideal technology for indoor applications. High Pressure Sodium Vapour Lamps are the most energy efficient lamps with the luminous efficacy more than 120 for higher wattage lamps. HPS Lamp is the better version of its counterpart LPS Lamp. For situations where … Sodium lamp performance is directly related to the gas pressure inside the arc cylinder. Suitable for use in open and enclosed luminaires. Yellow and white objects look yellow, all other colours appear as various shades of grey and black. Required fields are marked *. Mercury lamps are available in medium and mogul base versions; and while most wattages require a ballast to operate, some have an internal start that does not require a ballast (often referred to as “self-ballasted” mercury). The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger glass bulb. High pressure sodium vapor lamps have found widespread use during the past decade for commercial lighting applications, especially outdoor lightings. While many applications are ideal for Mercury vapor lamps, they are being challenged by the higher efficiency and better color balance of metal halide and ceramic metal halide lamps, and LED technologies. Industrial installations. There are two varieties of such lamps: low pressure and high pressure.Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps. The mechanism in mercury vapour lamp is more involved and sequential. Some mercury vapor lamps have been known to last for 40 years. 3. The advantage is that it produces a bright white light, with relatively long life. TrustSEAL Verified. Surya E-40 150w Hpsv Tubular Lamp ₹ 310/Piece. … Low-pressure sodium lamps are one of the most efficacious light sources. They are use in lighting streets, squares, tunnels, dock yards, bridges etc. Reflector: Highly effective reflectors to improve the light efficiency … This blog showcases in detail the working of High-Pressure Sodium Vapour Lamp. This low color rendering index essentially means that it is very difficult to differentiate between the different colors of objects illuminated by this lamp. Mercury … Such lamps are described in U.S. Pat. For example, metal halide lamps are … Outdoor applications only in suitable luminaires. As a result, the colors of illuminated objects are not easily distinguished because they are seen almost entirely by their reflection of this narrow bandwidth yellow light. The getter keeps a stable vacuum by sucking out remaining oxygen and unwanted gasses. • High pressure sodium lamps are the most efficient artificial white light source with about 29% of the energy used by the lamp producing light. 4. Table 1 compares each lamp according to several features [2]. Mercury vapor lamps are … High Pressure Sodium Lamp: Working Principle . The sodium vapor strikes an arc over 240 C. The sodium is mixed with other impurities to create a more "white" light. 4.Rated Temperature : -60 -+250 ℃ 5.Arc Tube :Ni Tube. High-pressure sodium (HPS) lamps are smaller and contain additional elements such as mercury, and produce a dark pink glow when first struck, and an intense pinkish orange light when warmed. This is because most of the light emitted from a sodium vapour lamp is concentrated in the yellow part of the visible spectrum (around 580-590 nm). as more sodium vapor, enters the arc stream. The heavy duty transformer or ballast is also long lived if the bulbs are changed out before they burn out. This is a major concern in applications where prolonged lighting interruption could create hazardous conditions or a manufacturing shutdown. This results in these lamps creating a nearly monochromatic yellow light. Average lifetime: up to 20,000 h. Areas of application: Streets. When the lamp is turned on it emits a dim red/pink light to warm the sodium metal and within a few minutes it turns into the common bright yellow as the sodium metal vaporizes. Base Type: E-27. Works by electric discharge (passage of electricity through sodium vapours at high/low pressure) Works through the combined effect of electric discharge through mercury vapours and fluorescence from phosphors (luminescent materials).