Product newsletter from the Photone grow light meter app, mixing app update announcements with explanations of PPFD, DLI and how phone-based measurement compares with professional PAR sensors. Readers get practical guidance on measuring light for plants, alongside promotional comparisons favouring the app.
Weekly picks
Get the best new newsletters in your inbox
One short email a week with hand-picked newsletters from the index. Free, no spam, unsubscribe anytime.