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  1. Gas-discharge lamp - Wikipedia

  2. Spectral Lamps - Spectrolamps

  3. Gas Discharge Lamps – operation principles, arc lamps, flash, …

  4. Philips Spectral - Helium - Lamp Tech

  5. Spectral Lamps – calibration lamps, low pressure gas discharge ...

  6. Amazon.com: Helium Lamp

  7. Helium - De Padova

  8. How Do Helium Lamps Produce Light? - Physics Forums

  9. Helium Lamp | Products & Suppliers - GlobalSpec

  10. Helium Discharge Spectral Line Source - Lamp Tech