Thanks again for clarifying it, bubbas.

95 lm/W for a 2700K spectrum is more reasonable for the efficiencies of induction fluorescents actually running. It may be realistic, as its a little better than other models running, but no for a large margin. I tend to take with a grain of salt large improvements on efficacy when they arnt backed with measurements :wtf:

That improvement (from the 75-85 lm/W of most induction light Im aware of) maybe due to use a high wattage unit. Maybe manufacturer is exaggerating a little.

There is no any definition of plants lm, so its an unmeangliful figure. It would depend on what "plant sensibility" curve is used.

25W for the ballast is very reasonable for a 300-400W unit. Some electrodeless lamps, as Luxims ones, have a problem with the ballast efficiency, at least at medium wattages. Including it, the 300W units drops to a total wall plug efficiency of 87lm/W, which is still good, on the level of HO T5's. But its clear that these 300 or 400W units achieves way higher intensities than T5s can provide.

I have a sheet of the measurement of a 6450K induction fluorescent lamp of 300W (actually, 312W, but as its in chinese, I dont know if its the bare bulb or it includes the RF ballast), I dont know if its of this lamp or one very similar, the lamp is coded ZX-HX 300W. It gets 23881.5 lm (76.5lm/W) and 80.9 PAR Watts, about 337 micromols of PAR photons per second.

What still surprises me is the quantum meter with 2000uE/m2 max peaking at 3ft from the bulb. With a similar quantum output than the HPS lamp, they shouldnt peak at very different distances. But from 1.5 to 3ft is a very large difference. 2000uE/m2 is about 125000lux of sunlight (and 170Klux of HPS), a very high figure that obligues to wear sunglasses.

Perhaps was it due by very different reflector shapes? It would point up to the induction unit concentrating light below the bulb a lot more than the HPS does. At first view, the induction reflector not seems to concentrate the light so much. But sometimes reflectors do different to one may think just by a visual inspection.

Did you measure how was the light distribution along an horizontal plane below the lamp? It would be very useful to know how the reflector is distributing the light, and will provide context to the measurement on the vertical plane.

Looking forward for pics of the test :thumbsup:
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