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Gas-discharge lamp - Wikipedia
Spectral Lamps - Spectrolamps
Gas Discharge Lamps – operation principles, arc lamps, flash, …
Philips Spectral - Helium - Lamp Tech
Spectral Lamps – calibration lamps, low pressure gas discharge ...
Amazon.com: Helium Lamp
Helium - De Padova
How Do Helium Lamps Produce Light? - Physics Forums
Helium Lamp | Products & Suppliers - GlobalSpec
Helium Discharge Spectral Line Source - Lamp Tech