This low color rendering index essentially means that it is very difficult to differentiate between the different colors of objects illuminated by this lamp. advantages of sodium vapour lamps in green buildings: Efficiency: Sodium Vapour Lamps are very efficient, turning one watt of power into a whopping 200lumens! Compare this with the 12 lumens per watt of an incandescent bulb, or the 60 lumens per watt of a CFL, or the 90 lumens per watt of FTL. The main advantage of HPS lamp over LPS lamp is that former emits more acceptable color. Disadvantages: This phosphor technology offers better color rendition than the more efficient, high or low-pressure sodium vapor lamps, but still falls short of metal halide and ceramic metal halide sources. I am a beginners in this field. Advantages: - Good efficiency lamps after s have a high lumen per watt rating - Color rendering is better than that of high pressure sodium street lights - Some lamps last far longer than the hour mark, sometimes 40 years. The arc tube is made of a ceramic material which can withstand temperatures up to 2,372°F. No light source offers a full set of advantages, and the SOX lamp is certainly no different. It is good. Thank you! But I am able to run this site only because of the ads. However, it is not easy to buy the source and it does not seem easy to use it- it also requires special lamp-holder. But, unfortunately, they have very limited colour rendering properties, as they produce monochromatic, deep yellow coloured light only. Sodium azide reasonably active (should be used at 0.1 g per 100 ml or somewhat lower) , is very cheap, and easy to wash out of suspensions. Low operating temperature. Just wondering how we calculate the intensity. i have seen in many literature they used xenon and mercury as UV source. Illumination with the cap down would cause an accumulation of sodium behind the electrodes, and the glass-to-metal seals in this region are a weak point which can fail in the presence of excess sodium. However, they find continued patronage among environmentally sensitive users, due to their efficiency and long life. Thank you everyone in advance for your valuable suggestions. The most popular VIS-light source for measuring photocatalytic activity must be XBO R 300 W/60 C OFR by Osram. Life range between 6000 hours to 15000 hours. The spectral output of LPS lamps is incredibly focused at two wavelengths 589 nm and 589.6 nm. This blog showcases in detail the working of High-Pressure Sodium Vapour Lamp. What are the advantages of LEDs over Sodium Vapour lamps in street lighting? What are the disadvantages of Sodium Vapour lamps? Where are Sodium vapour lamps used? Colour rendering: The colour rendition properties are not comparable to the other lamps- the white SON lamp has a Ra value of 80 while the SOX has a Ra of just 20 which is way below that of an Incandescent (Ra -100). You may wish to specify you experiment in order to check pro and cons. A Compact Fluorescent Lamp (CFL) has the characteristics and advantages of linear fluorescent lamps but its compact size is achieved by folding the discharge path, retaining high efficacy. Advantages and Disadvantages of LED Advantage. Thanks Dr. Zhi Jiang . Common uses: large areas like parks, street lighting, high ceiling buildings, gyms. The light driven water oxidation/reduction is one of the main project in our group. What are the disadvantages of Sodium Vapour lamps? Depending of your expecific experiment you can use one of the lamps you mentioned or the binary  combinations (such as HgXe). 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