Beauty and strong shining near Tesla coil or plasma ball! Just look at the photos! They are real!

Based on spectral tube LT-2, just without base:)

Actually here is scheme on the last photo where says power source voltage 500V 100W. Resistor R1=15kOm 15W, R2=0..20kOm 15W (variable). If connect by datasheet for measure spectre of light radiation. If for fun or for installation beauty DIY - better use Tesla coil, even so simple and small as on photos. 

Datasheet parameters:

• Spectral lamp of glow discharge with a hollow cathode LT-2
• Ignition voltage: 450V max. Discharge voltage: 250V max.
• The analytical line: depends on element
• Discharge current: 15 mA
• Element: Random(Ti, W, Cr, Pb, Ag, Si...etc)
• 
  
• Spectral lamp of glow discharge with a hollow cathode LT-2 is intended for use as a radiation source spectra of various chemical elements in the equipment of nuclear resonance spectrophotometry, operating in continuous and pulse modes. NOS, have a signs of long storage, without boxes to make it less weight.