I have to assume you had very poor uniformity, and you did not measure the PPFD. How many got bleached? Not all of them. I also forget many of these units do not have dimming circuitry. Where you put the fixture as close as you want then adjust the PPFD to what you want. I have never had a fixture without a dimmer. And I use wide angle OSRAM SSL150 LEDs without optics to get good uniformity at minimal distance between the fixture and canopy. And I have the app that simulates the spacing and height to find the optimum height and spacing. I do everything possible to minimize the height. The Inverse Square Law is important. The power can be reduced to 10% (one tenth) when the height is lowered from 19" to 6". Cutting the electric cost 90%. A lot of the box type fixtures narrow angle optics that concentrate the slight into a smaller footprint and designed for a higher height. That does not make sense to me. The only reason to do that is to be able to publish a spec with a high PPFD. I did look for optics on the box before. At 400 Wall Watts that unit is not very powerful with epistar LEDs. The uniformity is important as I mention. 6" IF the light spreads across the canopy. If the uniformity sucks and the light is concentrated in one spot, then no it cannot be done. I assume you read my diatribe on Watts. Watts doesn't mean Jack Shit! What matters is the intensity of the photons hitting the canopy. When people buy a fixture based on Wall Watts you are only encouraging the vendors to use shitty inefficient power supplies. Buyers need to smarten up. And yes, I know that is not easy. It's a nightmare out there. The is a shit load of things between the wall and the photons exiting the LEDs that can degrade efficiency. Heatsinks and thermal management are expensive. Temperature degrades efficiency enormously. But if you buy on wall watts the vendor can fuck everybody. And that is what they are doing. The use inefficient epistar LEDs, shitty power supplies, and only enough thermal management so the LEDs do not die during the warranty period. And they get to charge more for doing a shitty job because the buyers are uneducated in how to choose a fixture. The most important thing is the amount of radiant flux, the PPFD. Then uniformity. Then the amount of electricity. Then the cost. A dimmer is a very good feature. You must also understand the "Reviews" are paid advertisements. Likely everyone of them.