SE5- SE4- SE- SE6- SE- SE1- SE- This safe spectrum power supply features encased spectrum tubes. No Exposure to Voltage Source No Electrodes in Bulbs All Spectrum Tubes Are Encased Inside the Power Supply For Use with Spectroscopes or Spectrometers Bulbs Have 1 Hours of Burn Time This innovative device far surpasses the safety, capability, and convenience of any other spectrum power supply available. Most current power supplies expose students to V. This deviceâ€s new, advanced design and features eliminate studentâ€s contact to the voltage source. This safety feature allows you to focus attention on your students' learning experience instead of worrying about their safety.