Are metal halide lamps included in Subchapter 41?
Yes. In 7:28-41.2, the definition of mercury vapor lamps includes metal halide lamps. Metal halide lamps are part of the high intensity discharge (HID) family of lamps that includes mercury vapor and high pressure sodium vapor lamps. Low pressure sodium lamps are technically not a high intensity discharge light but they are usually categorized with other HID sources because the applications are similar. 2. Does this mean that all HID lamps are included under Subchapter 41? No. High and low pressure sodium lamps are not included in the regulation. But please be aware that most high pressure sodium lamps also have inner arc tubes that contain mercury (generally a lesser amount than the mercury or metal halide lamps) and may possibly present an UV radiation hazard if the integrity of the outer bulb is compromised. With so many new and different types of bulbs on the market, it is best to consult the respective MSDS sheet for potential health hazards. Low pressure sodium vapor lamps do not
