We have determined that by comparison with conventional plasma lamps using electroded bulbs we can achieve higher wattage per unit length of plasma.
In order to achieve efficacies > 110 lumens per Watt we have found it necessary to increase the loading per unit length of plasma to be greater than 150 W per cm. This makes it particularly easy to vary the power input per unit length of plasma by varying the length of the LER and using butt sealed tubes at each end of the resonator the cost is kept to a minimum.