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Try shifting your DLI between stages as smooth as possible.
Always choose higher wattage model than recommended here. Powerfull fixtures will always work more efficiently and will have better radiator. This will ensure long life of your fixture.
Even though PPF/$ is the most important metric for choosing the light, it is also important to pay attention to the driver, as this part fails first in 99% of cases.
To calculate the LUX coefficient you need to:
1) Find the most central reading on a PAR map for a fixture that you have.
2) Use luxmeter to measure light in the center of the lamp at a distance identical to the manufacturer’s PAR map.
3) Enter both values into the calculator.