The streetlamp has a reflector, so its light i pointed upwards! The Luxim argon lightsource in the video has no reflector, and so it spreads its light in all directions (which is clearly visible in the video).
And the camera is "looking" at the light sources from the side.
OF COURSE a 250 W non-directional light looks brighter from the side than a directed light turned away from the viewer!

Also, the argon gas is a plasma light source at 6000K, and thus has about the same spectrum as the sun.
So, is the IR component (quite substantial in sunlight) of the ligthsource included in the Lumen figure? That part is of little use when lighting up streets or homes. And how much heat due to the IR radiation is produced? Seeing a lightsource being turned on for a few seconds in a video doesn´t say a lot about its long-time performance.

Finally the energy is transmitted to the gas "without electrical contacts". Well, naturally, it´s 6000 K hot! But this requires an extremely strong electomagnetical high frequency field, so how do you keep the EM emissions that might end up as radio, TV or communications frequencies down to the few microwatts permitted by laws in many countries?

Don´t get me wrong. I think it is a very interesting concept, and bringing down the energy costs is always good, but we shouldn´t be too overwhelmed by new technology just because it is new. It might be a future light source, it might not. Just because it brings you light, doesn´t mean it is ready for mass use.
A nuclear bomb produces huge amounts of visible light, but there are side-effects...