Planner inputs
Example data table
| Stage | Dates | On | Off | Target (K) | Warm/Cool mix |
|---|---|---|---|---|---|
| Seedlings | 2026-02-07 → 2026-02-21 | 06:00 | 22:00 | 6000 | ~12% / 88% |
| Vegetative | 2026-02-22 → 2026-03-21 | 06:00 | 22:00 | 5000 | ~35% / 65% |
| Flowering | 2026-03-22 → 2026-04-18 | 07:00 | 19:00 | 3000 | ~88% / 12% |
Mix values assume a 2700K warm channel and 6500K cool channel.
Formula used
This planner treats your fixture as a two-channel blend: a warm channel and a cool channel. To hit a target color temperature, it solves a simple weighted mix.
- TargetK = r × CoolK + (1 − r) × WarmK
- r = (TargetK − WarmK) / (CoolK − WarmK) (clamped from 0 to 1)
- Cool% = 100 × r, Warm% = 100 × (1 − r)
- If you use sunrise/sunset ramps, the estimated average becomes: AvgK = [RampH × WarmK + (H − RampH) × TargetK] / H, where H is photoperiod hours.
How to use this calculator
- Enter warm and cool channel kelvin ratings.
- Set a ramp time if you fade lights in.
- Add one or more stages with date ranges.
- Choose daily on/off times for each stage.
- Enter a target kelvin for each stage.
- Press generate to view schedule and exports.