Unbracketed values are the lines available from the commonly used low-power (5–50 mW), air-cooled lasers. New solid-state lasers are introduced frequently; other wavelengths will probably be available soon. Many more lines, including those in the UV ranges that are listed in brackets, are available from the large high-power (1–5 W), water-cooled versions of the gas lasers. In contrast to the lasers, the Hg arc lamp emits at all wavelengths between its major peaks, at a level of 5%–10% of the peak intensity.