Monster Gardens does a lot of the beta testing for Nanolux. The independent test results I've seen show a slight edge Nanolux has on Gavita...although they are very close.
Also, DEs are designed to work in tandem with other DEs. The secret to DEs and their increase in crop yield is not just about the lumens or PAR value, but rather the fact that the hood is designed to work with other lights. DEs produce what's known as horizontal light penetration in addition to the usual vertical penetration most are familiar with. This interlacing of light patterns increases the light penetration deep into the canopy by entering at multiple angles, averting the leaves that block vertical light.
Companies are coming out with hoods that will do a 5'x5' solid footprint, but this will simply be too much light for such a small area. Way beyond the plant's ability to utilize that much light.
People that have tried to use it as a single light will mount it closer to the canopy. This is analogous to making the footprint more concentrated with a new hood designed to do so. What happens when someone does this is that the plant starts to bleach, and if the light and heat are concentrated enough into one area, the plants shut down completely.
If you decide to use a DE in a tent I would seriously consider buying an air cooled hood like the AC/DE hood from Sunlight. If you use the open reflector, you will end up spending just as much money on ventilation each month as running the DE, and there's no guarantee that this will even work.
