Evidence-based
Recommendations begin with DLI, PPFD, EC, and published tolerance ranges instead of generic marketing language.
Built for growers who make adjustments from measured conditions
GrowLight provides free grow light scheduling and fertilizer tools for indoor growers, hobbyists, and horticultural professionals. Calculations reference published plant science research and practical growing routines used in propagation, greenhouse work, and home plant care.
What we focus on
Clear inputs. Plain-language outputs. Decisions you can apply at canopy height or mixing tank level without signing up for software.
GrowLight was shaped around repeated field questions: how many hours does this fixture need, is this EC too high, and which plants truly require supplemental light from October to March.
Values
Practical
Outputs are framed as hours, dilution amounts, and straightforward care notes that suit real routines.
Accessible
The tools are free to use on desktop or mobile and avoid unnecessary account barriers.
No account required
Growers can open the calculator, check the numbers, and return to the bench in under a minute.
Team
Marcus Ford
Light Science Lead
Marcus reviews fixture output, canopy maps, and fixture placement data for indoor crops and educational workshops.
Diana Holt
Nutrition Specialist
Diana studies feed schedules, nutrient excess patterns, and root-zone response in container-grown tropicals and herbs.
Simon Cole
Research Advisor
Simon compiles indoor light observations and greenhouse reference data into species-level guidance for practical use.