How to Identify Lamp Types

1. Classification by the surface load




Bulb wall loading

Unit area


Unit length

Low-pressure mercury lamp

Low-power Class


Lamp with the same rating as of standard fluorescent lamp

Developed by GE and Philips in 1938, and introduced into Japan after the World War‡U.

Approx. 0.05

Standard class


Developed as an enhanced grade of sterilization lamp to sterilize ultra-pure water in Japan in late 1970s.Natural air cooling and indoor lighting possible.

Approx. 0.14


High-power Class


Designed to increase the output of light per unit length, this lamp requires forced cooling. There was an ultra-high output lamp available in the market before, but its place has been taken place by this lamp developed in Japan later. The lamp now represents those for cleaning and modification in surface processing practices.

Approx. 0.21


Ultra-high Power Class


Developed by ABB (Switzerland), this lamp requires forced cooling. Its UV intensity is high, but there is a limit to its work as a low-pressure mercury lamp for discharge under low gas pressure. With economical difficulty including its life span, the lamp is going to disappear from the market.

Approx. 0.60

High-pressure Mercury Lamp   HL    
Metal halide Lamp   ML    

2. Classification by the Shape

V: Whorled type, P: Spiral type, R: Semi-circular type

In case of high-pressure lamp: Indication of built-up style

  Built-up   Built-up   Built-up
A Lead wire connection only D Standard ceramic base type J Jacket type
B Stainless steel plate with spring E Ceramic base without spring N Threaded cap type
C Coiled-end type G Special case of HL100G only W

Double-jacket type

3. Classification by the material of bulb

   1. Ordinary Fused Silica Glass(H)

Made of fused natural quartz, it is a most extensively available fused silica glass commonly referred to as " Silica Glass ".
The transmission rate of 185nm depends largely on the purity of raw materials with a range of 15% to 40%.
The generation volume is less than ozone by silent discharge, but it generates approx. 1999ppm of ozone at maximum.The code for the fused silica glass lamp is "H"..

   2. Ozoneless Silica Glass(L)

Heavy metals are added to fused silica glass to form this silica glass, which does not allow any transmission of 240nm or under UV radiation.
As ozone gas is harmful to human body .Ozone less is used for sterilizing lamps for indoor use.
As the short wavelength UV radiation has a sterilizing power, there is no need to use an ozone less lamp (Code "L")secifically for water sterilization.

  3. Synthetic Silica Glass(S)

Extremely high-purity silica glass synthesized chemically from silica compounds.
It excels in light transmission owing to the little content of impurities. It costs more than four times of silica glass.
The light source for photo surface processing for which the 185nm wavelength plays the main role is made of synthetic quartz glass.
It has a high ozone-generating capability, but is seldom used for other applications than UV/Ozone surface processing because of the high cost . Code: " S "
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