Direct answers to the technical questions that can change which product belongs on your shortlist, with relevant products to help connect specifications to actual models.
PPFD is the instantaneous photon flux reaching one square meter each second; DLI is the total photons accumulated over the photoperiod. Commercial growers need both because a crop responds to light intensity over time, not to fixture wattage alone.
Read the answer →Large grow facilities often use 208V, 240V, 277V or higher-voltage distribution to reduce current, while many commercial fixtures support a broad input-voltage range. The correct voltage is whichever the exact fixture and facility electrical design support.
Read the answer →Photon efficacy in µmol/J tells you how many photosynthetic photons the fixture emits per joule of electrical energy. Higher efficacy can reduce electrical power for a given PPF, but it says nothing by itself about canopy uniformity or spectrum.
Read the answer →PPF is the total photosynthetic photon output of the fixture; PPFD is the photon density that actually lands on a square meter of canopy. PPF describes the source, while PPFD describes the delivered intensity at a location.
Read the answer →Watts per square foot is only an electrical-density shortcut. It ignores fixture efficacy and spectrum, so two rooms at 30 W/ft² can deliver very different amounts of plant-usable light.
Read the answer →Mounting height comes from the fixture’s PPFD distribution and target canopy intensity. There is no universal 12-, 18- or 24-inch answer because a narrow board light and a wide multi-bar fixture spread photons differently.
Read the answer →Dimming lets growers match intensity to plant stage, daylight contribution and DLI target instead of wasting full power all day. At scale, centralized dimming also makes crop recipes and demand management easier.
Read the answer →“Full spectrum” is a marketing description, not a single standardized recipe. Compare the actual spectral power distribution—blue, green, red and far-red where relevant—and decide whether it fits the crop and production stage.
Read the answer →Nearly all electrical power consumed by indoor lighting eventually becomes heat inside the facility. A 500W fixture therefore contributes roughly 500W of heat load to the space, even though LEDs are more efficient at creating photons than older lamps.
Read the answer →The required ingress-protection rating depends on moisture, spray and cleaning practices in the facility. Higher IP ratings provide more protection against dust and water, but the exact number should be selected from the environment—not assumed from the word “commercial.”
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