Grow Light Meter: PPFD PAR DLI

Are your plants getting enough light? Grow Light Meter turns your phone into a simple light meter for indoor gardening, so you can check whether a windowsill, shelf or grow light is bright enough for your plants to thrive. Point your phone at the spot where a plant sits and get an instant reading of light intensity, estimated in PPFD (the light plants actually use), with PAR and a daily DLI estimate so you know how much light your plants receive over a full day. WHAT YOU GET • PPFD reading — see the photosynthetic photon flux density at plant level, the number that really matters for growth. • PAR & lux — view photosynthetically active radiation and raw lux side by side. • DLI estimate — turn light intensity plus your daily light hours into a Daily Light Integral, the total light your plant gets each day. • Plant targets — compare your reading against typical needs for low-light foliage, houseplants, herbs, seedlings and high-light fruiting crops. • Find the bright spots — sweep around a room to discover where light is strong and where plants will struggle. WHO IT'S FOR Houseplant lovers, indoor gardeners, hydroponics and grow-tent growers, seed starters, and anyone setting up LED grow lights who wants to place plants and lamps with confidence. A NOTE ON ACCURACY Readings are an estimate from your phone's camera, not a lab-grade quantum PAR meter. Use them to compare spots, position grow lights and spot dark corners — not for precise scientific calibration. Results vary by device.

Grow Light Meter has been rebuilt on a newer, shared foundation. On the very first launch after installing, the opening-screen ad is prepared without waiting for online settings (the 5-second limit is unchanged), and the spacing between full-screen ads now also holds when you close and reopen the app. Your saved readings, calibration and plant and light settings are untouched.