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NEW!!!  -   Low Pressure UV (Ultraviolet)
Germicidal Lamps
 

Description
Low pressure UV germicidal lamp is a kind of short wave low pressure mercury vapor discharge lamps. The excited atom of mercury vapor emits short wave ultraviolet light under the low pressure in the sealed glass tube.

Germicidal lamps should not be confused with fluorescent lamps for while fluorescent lamps are also Low pressure mercury lamps. The fluorescent lamps use less purity normal glass tube which transmit small amount of ultraviolet, the coated phosphor powder inside the glass tube converts the ultraviolet into visible light to illuminate the lamp. While germicidal lamp uses high purity quartz glass tube which transmits the highest possible ultraviolet.

Germicidal lamps can not be confused with sun tanning lamps or black light lamps either, for while these are also ultraviolet tamps, the ultraviolet produced is of longer wavelength and is not useful for germicidal purpose. Germicidal lamps emit short wave ultraviolet that are lethal to microorganism.

Germicidal Behavior
It has been many years since it first became necessary to disinfect water and air. At first people choose chemical methods to disinfect water, chlorine in particular. However, scientific research shows that these processes have bad effect on health and environment. Chlorine has reaction with the substances in the water and form residues and by products which do damage to the environment and health. Furthermore, some pathogens have already developed resistance to chlorine, calling into the question the success of the disinfection process.

Today, after many years of research, it has been discovered that the most effective alternative process available to us is the disinfection of water and air using ultraviolet light (UV). Ultraviolet ray is light with very high energy level and a wavelength of 200-400nm. One of the most effective wavelengths for disinfection is that of 254nm. Over 90% of total UV radiation energy is at 254nm. Wavelength of 200-280nm is named JVC. So disinfection using 254nm wavelength is called UVC disinfection. 254nm radiation destroys microorganisms by changing their genetic information or DNA.

Ozone Action

The deep UV radiation at 185nm wavelength produces abundant amounts of ozone in air. Ozone is an extremely active oxidizer and destroys microorganisms on contact. Ozone also acts as a deodorizer. One of ozone's advantages is that it can be carried by air into places that the UV radiation cannot reach directly. Ozone in conjunction with hydrogen peroxide (H2O2) produces highly energetic particles called hydroxyl radical (OH). The radical reacts with and oxidizes most organic contaminants. Hydroxyl radical oxidation is much more effective than direct oxidation with ozone. This radical oxidation technology is called Advanced Oxidation Process (AOP) or Advanced Oxidation Treatment (AOT).

Type & Specification

Ozone Free UV Germicidal Lamps

L (low) germicidal lamps use ozone free fused quartz which cuts off 185nm ozone-producing line and emits 254nm line only. L type germicidal lamp is used to disinfect air, water and surface where ozone production is not desired, such as UV water purifier used at home Please see below graph 1 for the spectral energy distribution of ozone free UV lamps.

Graph 1 - Spectral Energy Distribution
of Ozone Free UV Germicidal Lamps

Ozone Producing UV Germicidal Lamps

VH (very high) germicidal lamps use high purity fused quartz which emit both 185nm ozone-producing line and 254nm germicidal line. VH lamps produce ozone to oxidize hydrocarbons to get TOC (total organic carbon) reduction water used by industries such as semiconductor industry, where super-purified water is necessary. VH lamps are also used to treat soil and groundwater contaminated with petroleum hydrocarbons, metals, VOCS, TNT in Advanced Oxidation Process (AOP) and Advanced Oxidation Treatment (AOT). Please see below graph 2 for the spectral energy distribution of ozone producing UV lamps.

Graph 2 - Spectral Energy Distribution of
Ozone Producing UV Germicidal Lamps

Low Pressure Amalgam (HO) UV Germicidal Lamps

High Output (HO) Germicidal Lamps emit 40%-60% more UV output than normal lamps of the same length. It is well known that above a certain mercury vapor pressure, the UV output decreases; due to the increase of the self-absorption of res0naneo line in the sealed glass tube: The mercury pressure is decided by the temperature inside the sealed glass tube, as a result, excessive current input to the lamps tube decreases the UV output intensity. By using the amalgam this problem can be solved. The physically identical amalgam lamp omits 55% more UV when the input current is increased from 425mA to 900mA, while the UV output of the normal germicidal lamp is decreased.
See below graph 3. For the available specification of HO lamps, please see table 1, table 2, table3, table 4.

Graph 3 - UV Output vs. Lamps Temperature

Low Pressure Indium Amalgam (VHO) UV Germicidal Lamps

Very high output (VHO) germicidal lamps emit 3 times the UV output of normal germicidal lamps. It is indium doped amalgam lamps that are made for the optimum operating temperature of 100-120 ℃ so that it can be made into high watts lamps The lamps are designed primarily for use in wastewater and municipal drinking water treatment. The lamps provide the equipment manufacturers the benefit of designing equipments to achieve the required disinfection rates by using fewer lamps and fewer Supporting components, The VHO lamps are less sensitive to the varying water temperature which allows lamp effectiveness to be maintained.
For the available specification, please see table 1, table 2, table 3.

Low Pressure Slim-line Double Ended Germicidal Lamps

Slim-line germicidal lamps are instant start, hot cathode utilizing a coil filament on each end which operates hot. Lamp life is governed by tile life of the electrodes and is affected by tile frequency of starting.

Table 1 - Slim-line Double Ended 2 Pin Germicidal Lamps
Lamp Models Lamp Watts Dimension (mm) Cap Lamp Voltage Lamp Current UV Output  Useful Life
Ozone Free Ozone Producing W Length (L) Diameter (D) (B) V@50Hz mA Watts W @1m mw/cm3 Hour
G4T5L/DE2P G4T5VH/DE2P 4 135 15 G5 24 160 0.9 10 6000
G6T5L/DE2P G6T5 VH /DE2P 6 212 15 G5 48 160 1.7 12 8000
G8T5L/DE2P G8T5 VH /DE2P 8 288 15 G5 64 190 2.5 16 8000
G10T5L/DE2P G10T5 VH /DE2P  10 331 15 G13 70 220 2.7 20 8000
G15T5L/DE2P G15T5 VH /DE2P 15 437 15 G13 71 300 4.9 30 8000
G15T6L/DE2P G15T6 VH /DE2P 15 437 19 G13 71 300 4.9 30 8000
G20T5L/DE2P G20T5 VH /DE2P 20 589 15 G13 84 320 7.5 60 8000
G20T6L/DE2P G20T6 VH /DE2P 20 589 19 G13 91 320 7.5 60 8000
G30T5L/DE2P G30T5 VH /DE2P 30 894 15 G13 125 300 13.5 90 8000
G30T6L/DE2P G30T6 VH /DE2P 30 894 19 G13 125 300 13.5 90 8000
G30T8L/DE2P G30T8 VH /DE2P 30 894 25 G13 125 300 13.5 90 8000
G36T5L/DE2P G36T5 VH /DE2P 39 842 15 G13 103 440 15.3 93 8000
G40T5L/DE2P G40T5 VH /DE2P 40 1199 15 G13 130 330 16 100 8000
G40T6L/DE2P G40T6 VH /DE2P 40 1199 19 G13 130 330 20 100 8000
G40T8L/DE2P G40T8 VH /DE2P 40 1199 25 G13 130 330 20 100 8000
G55T8L
/HO/DE2P
G55T8 VH /HO/DE2P 55 893 25 G13 83 770 18 150 8000
G64T6L/DE2P G64T6 VH /DE2P 65 1553.6 15 G13 220 425 20 200 8000
G75T8L/DE2P G75T8 VH /DE2P 75 1199 25 G13 108 840 25.5 180 8000
G67T5L/DE2P G67T5 VH /DE2P 79 1629.8 15 G13 238 425 26 205 8000
G36T5L/
HO/DE2P
G36T5 VH /HO/DE2P 85-105 842.44 15 G13 120 800-1000 27-34 250-280 8000
G115T12L/
VHO/DE2P
G115T12L/VHO/DE2P 115 1199 36 G13 92 1100 39 300 5000
G64T5L/
VHO/DE2P
G64T5 VH /VHO/DE2P 155-195 1553.6 15 G13 220 100-1000 45-58 380-485 5000
Table 2 - Slim-line Double Ended Single Pin Germicidal Lamps
Lamp Models Lamp Dimension(mm) Cap  Lamp Lamp Lamp Output Useful
Watts Voltage Current Life
Ozone Free Ozone Producing W Length Diameter (B) V@50Hz mA Watts @1m Hour
      (L) (D)       W mw/cm3  
G14T5L/DE1P G14T5VH/DE1P 14 287 15 Single Pin 40 400 4 35 8000
G25T5L/DE1P G25T5 VH /DE1P 25 436 15 Single Pin 62 400 6 69 8000
G36T5L/DE1P G36T5 VH /DE1P 39 842.4 15 Single Pin 115 425 12 120 8000
G64T5L/DE1P G64T5 VH /DE1P 65 1553.6 15 Single Pin 250 425 22 200 8000
G36T5L/HO/DE1P G36T5 VH/HO/DE1P 80 842.4 15 Single Pin 120 900 30 260 8000
G64T5L/VHO/DE1P G64T5VH/VHO/DE1P 150 1553.6 15 Single Pin 220 900 49 450 8000

Low Pressure Preheat UV Germicidal Lamps (GPH)

Preheal germicidal lamps are operated by a preheat-start circuit that employs a relatively compact and economical ballast. The preheat circuit requires four electrical connections per lamp and a slight to moderate delay is needed to start the lamp Due to increased circuit complexity, reliability is regarded as slightly less than slim-line or cold-cathode instant-start circuits.

Table 3 - Singled Ended 4 Pin Preheat Start Germicidal Lamps (GPH)
Lamp Models Lamp Dimension(mm) Cap Lamp Lamp UV Output Useful
Watts Voltage Current Life
Ozone Free Ozone Producing W Length Diameter (B) V@50Hz mA Watts @1m Hour
      (L) (D)       W mw/cm3  
G10T5L/SE4P G10T5VH/SE4P 10 212 15 4Pin 39 420 2.9 23 6000
G14T5L/ SE4P G14T5 VH / SE4P 14 287 15 4Pin 39 420 3.8 36 8000
G15T5L/ SE4P G15T5 VH / SE4P 15 303 15 4Pin 40 420 4 37 8000
G18T5L/ SE4P G18T5 VH / SE4P 18 356 15 4Pin 51 420 5.5 53 8000
G23T5L/ SE4P G23T5 VH / SE4P 23 436 15 4Pin 65 420 6.9 68 8000
G37T5L/ SE4P G37T5 VH / SE4P 37 793 15 4Pin 105 420 12.9 130 8000
G36T5L/ SE4P G36T5 VH / SE4P 39 846 15 4Pin 110 420 13 132 8000
G40T5L/ SE4P G40T5 VH / SE4P 40 851 15 4Pin 110 420 14 140 8000
G23T5L/ HO/SE4P G23T5 VH / HO/SE4P 40 436 15 4Pin 86 610 14 140 8000
G55T5L/ SE4P G55T5 VH / SE4P 55 1149 15 4Pin 150 420 16 150 8000
G36T5L/ SE4P G36T5 VH / SE4P 65 846 15 4Pin 110 775 19 165 8000
G64T5L/ SE4P G64T5 VH / SE4P 65 1553.6 15 4Pin 220 425 19 165 8000
G75T5L/ SE4P G75T5 VH / SE4P 75 1550 15 4Pin 210 420 21 180 8000
G36T6L/ VHO/SE4P G36T6 VH / VHO/SE4P 80 846 19 4Pin 120 1200 28 240 8000
G120T6L/ VHO/SE4P G120T6 VH / VHO/SE4P 120 1149 19 4Pin 170 1200 39 330 8000
G64T6L/ VHO/SE4P G64T6 VH / VHO/SE4P 150 1553.6 19 4Pin 220 1200 45 400 8000
G64T5L/ VHO/SE4P G64T5 VH / VHO/SE4P 155-195 1553.6 19 4Pin 220 800-1000 45-58 380-485 8000

Low Pressure Compact Germicidal Lamps

The design of "H" shaped and "U" shaped germicidal lamps is primarily employed in application where more intense UV radiation is needed in a limited space. So it is compact. H-shape and U- shape are also instant start lamps.

Remarks: Custom designed U shape germicidal lamps are available.

Table 4 - H Shape Compact Germicidal Lamps
Lamp Models Lamp Dimension(mm) Cap Lamp Lamp UV Output Useful
Watts Voltage Current Life
Ozone Free Ozone Producing W Length Diameter (B) V@50Hz mA Watts @1m Hour
      (L1) (L2)       W mw/cm3  
G5L/H/G23 G5VH/H/G23 5 85 105 G23 35 180 1.2 12 6000
G7L/H/G23 G7 VH /H/G23 7 115 135 G23 45 180 1.9 20 8000
G9L/H/G23 G9 VH /H/G23 9 145 165 G23 60 180 2.4 23 8000
G11L/H/G23 G11 VH /H/G23 11 215 235 G23 90 155 3 30 8000
G13L/H/GX23 G13 VH /H/GX23 13 170 190 GX23 60 285 3.6 35 8000
G5L/H/2G7 G5 VH /H/2G7 5 85 105 2G7 35 180 1.2 12 8000
G7L/H/2G7 G7 VH /H/2G7 7 115 135 2G7 47 175 1.9 20 8000
G9L/H/2G7 G9 VH /H/2G7 9 145 165 2G7 60 170 2.4 23 8000
G11L/H/2G7 G11 VH /H/2G7 11 215 235 2G7 91 155 3 30 8000
G18L/H/2G11 G18 VH /H/2G11 18 195 225 2G11 58 375 5.5 60 8000
G24L/H/2G11 G24 VH /H/2G11 24 290 320 2G11 87 345 8.5 90 8000
G36L/H/2G11 G36 VH /H/2G11 36 385 415 2G11 87 435 12 120 8000
G40L/H/2G11 G40 VH /H/2G11 40 503 533 2G11 120 385 15 135 8000
G55L/H/2G11 G55 VH /H/2G11 55 503 533 2G11 105 540 17 170 8000
G35L/HO/H/2G11 G35 VH /HO/H/2G11 35 195 225 2G11 87 435 12 120 8000
G60L/HO/H/2G11 G60 VH /HO/H/2G11 60 385 415 2G11 105 600 20 200 8000

Low Pressure Cold Cathode UV Germicidal Lamps

Cold cathode germicidal lamps are instant utilizing a large cylindrical cathode instead of a coil filament.Due to this construction, the lamps are not adversely affected by frequent start and the life is considerably in excess of other lamp types. Cold cathode germicidal lamps have favorable operating characteristics and maintain a high ultraviolet transmission throughout life even at reduced temperature. They are, therefore, widely used in walk-in refrigerators and holding rooms. Cold cathode UV lamps are well suited to disinfection of air and surface of unoccupied areas due to their long life and low depreciation. Cold cathode germicidal lamps are also employed in application where frequent start is a requirement.

Remarks: U shape circular shape cold cathode UV germicidal lamps are available. Custom designed cold cathode UV germicidal lamps are available.

Table 5 - Cold Cathode Germicidal Lamps
Lamp Models Lamp Dimension(mm) Cap Lamp Lamp Lamp Output Useful
Watts Voltage Current Life
Ozone Free Ozone Producing W Length Diameter (B) V@50Hz mA Watts @1m Hour
      (L) (D)       W mw/cm2  
G15CCL G15CCVH 15 357 15 Single Pin 180 90 2.8 22 20000
G22CCL G22CCVH 22 611 15 Single Pin 270 90 5.5 45 20000
G28CCL G28CCVH 28 865 15 Single Pin 350 90 8.5 63 20000
 

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