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7) When testing for lumen (PPF) output what is the required warm up time?

Typically 3 minutes warm up time is needed for 100% Lumen (PPF) Output. The output for an induction lighting depends on the mercury vapor pressure in the lamp which in turn is determined by the ambient temperature. These lamps use an amalgam system which results in low mercury vapor pressure before starting. However, an auxiliary amalgam is located in the discharge to ensure fast lumen run-up. When turned on, this auxiliary amalgam heats up, releasing mercury into the discharge. Light output quickly peaks and then dips slightly as mercury vapor pressure increases above optimum. After a few minutes, the mercury begins to go back to the main amalgam. The time required for the thermal equilibrium depends on ambient temperature and fixture design.

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Blending the Art and Science of Indoor Gardening

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