Gaseous hydrogen is most commonly delivered either by trucks or through pipelines. Because gaseous hydrogen is typically produced at relatively low pressures (20&#;30 bar), it must be compressed prior to transport. Learn more about gaseous hydrogen compression.
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Trucks that haul gaseous hydrogen are called tube trailers. Gaseous hydrogen is compressed to pressures of 180 bar (~2,600 psig) or higher into long cylinders which are stacked on the trailer that the truck hauls. This gives the appearance of long tubes, hence the name tube trailer. Learn more about tube trailers.
The hydrogen discharge tubes typically used in student labs are not designed for long-term use. After a couple of years, the tubes leak and air gets mixed with the hydrogen. This causes them to get dim and the weaker lines are almost impossible to see.
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It has nothing to do with the power supply and everything to do with how new the tube it and how many hours of use it has seen.
You need a new tube. I know this from many years of running this experiment.
EDIT Addition: In answer to the question about a higher voltage, running at a higher voltage for a new tube might provide brighter lines, but will also cause impurity gases to show their lines. Higher voltages will also cause much shorter tube lifetimes (faster leakage due to higher temperatures at the penetrations for the wires). Running a higher voltage on an old, leaky tube will not provide the improvement you need on the weak lines. I've tried it before.
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