Induction lighting is
fluorescent lighting, instead of an arc being produced inside the lamp to excite the gas, the gas is excited externally with a large coil.
Electrodeless lamp - Wikipedia, the free encyclopedia
there are no Induction lamps (afaik) that are made to equal the light output of say a 1000w
metal halide lamp, but you can get a 200 watt fluorescent (induction). They are large compare to a 250 / 400 watt metal halide lamp, so they are more difficult to retrofit.
It is best to use a fixture designed for the induction lamp with the proper reflector etc.