Quote Originally Posted by vanduction
There is only 10 days left until harvest so I decided to leave the lamp unchanged for the rest of this particular test. If this lamp is used again, it will (among other potential changes) have the shade enclosed to trap heat.

Both sides are still unimpressive, but the HPS still has the lead. Also you can see the leaves on the HPS are yellowing/dying a lot more than on the induction. Don't know what to make of that yet.

HPS:


Induction:
The yellowing is due to the HPS providing more PPFD than the induction lamp, the plant is using more nutrients as it receives higher energy amounts.

As far as the increasing of efficiency - induction lamps don't work like regular fluorescents that use electrodes. Electrode-based lamps run more efficient the hotter they get. Induction requires it to be cooler, and you need to direct as much of the EMF as possible directly into the tube.

If you want to increase the efficiency, you'll need to build a better waveguide in the tube and build a better diamagnetic shield around the entire enclosure to keep that EMF focused in the tube area for higher output.