At the time those lightsabers were produced by Master replicas, EL lighting was very popular, so that's what they used. MR later found that a string of led's were much economical and quite a bit brighter. EL blades still can't hold a candle to blades that use led strings, or single high-power in-hilt led's, so no one uses EL tech anymore, except in some cases for accent lighting. EL also requires a power inverter to invert the 9 or 18 volts of DC current over to 120v AC to power the EL sheet or wire that would be used to light the blades. Those take up a lot space inside a hilt, and space is a premium in most hilts.