Estimation basis: Retrofit supports two input methods. Existing Light Count directly compares the entered number of existing fixtures with the same number of FamousGrow fixtures using each fixture's rated input power; canopy dimensions are not required for the core energy-savings calculation. Canopy Dimensions sizes the FamousGrow plan from canopy/PPFD/coverage and applies that same fixture count to the existing system. Existing fixture PPF is diagnostic only and never resizes the direct retrofit comparison. All existing LED drivers and HPS ballasts are assumed inside the conditioned grow room; only FamousGrow's centralized AC-to-DC conversion is treated as outside. For Purpose-Built Integrated HVACD, Beta 42 independently calculates each room's lights-on sensible and latent loads: the convective/radiant/optical lighting buckets enter the room energy balance, an equal area-based plant evapotranspiration baseline converts sensible energy to latent moisture load, and a representative sensible/latent capacity envelope estimates required nominal HVACD capacity. Operating electrical input is calculated separately from the combined sensible + latent conditioning load using the published simultaneous rated capacity and kW input. Plant transpiration multipliers are currently 1.00 for HPS, traditional LED, and FamousGrow. A common non-lighting sensible load is applied equally to both rooms because absolute sensible/latent balance determines whether integrated HVACD is sensible- or latent-limited. For AC + standalone dehumidification, the existing coupled SHR/dehumidifier model remains unchanged. Unknown mode retains the simple sensible-only COP estimate. The iHP calculation uses 94.32% certified full-load AC-to-DC efficiency for the 250 V horticultural configuration; actual efficiency can vary with input voltage and loading. Integrated HVACD operating power is a representative constant-EIR total-load approximation derived from published simultaneous sensible/latent capacity and input power; it is not an equipment-selection or manufacturer part-load guarantee. Utility demand-charge savings use a separate Michigan tariff screening model and are added to dollars only when peak coincidence is confirmed. Beta 42 includes HPS lamp/ballast OpEx, traditional LED driver OpEx, New-Build electrical/control/cooling/power-conversion CapEx screening, and a separate Michigan utility-incentive screening layer. Potential and confirmed rebate dollars remain outside annual savings and physical CapEx totals until the dedicated ROI engine is added. LED driver replacement is annualized from operating hours and useful life; it is a lifecycle-cost reserve, not a prediction of exact annual failures. FamousGrow central-power maintenance allowance is currently $0/year. Reflectors, disposal, downtime, lift/equipment rental charges, thermal-life derating and other maintenance remain excluded. Traditional LED access/setup and troubleshooting labor are included as editable screening allowances in Beta 42. Recovered cooling capacity for LED retrofits is calculated separately from fixture-mounted driver loss and is not added to annual HVAC savings a second time; an avoided/deferred HVAC project value is included only when the user explicitly confirms that the recovered capacity has real project value. Beta 42 no longer models customer-specific utility PF penalties. PF is handled as a simplified conservative electrical-loss term using only the existing-light PF input. THD is not assigned a utility tariff value; instead, Beta 42 uses a conservative harmonic-current feeder-loss screening estimate and includes that small kWh difference in annual savings. Equipment-room cooling, winter heat recovery, and any unmeasured lighting-specific change in plant transpiration are not included.

FamousGrow PPF / PPFD calculation basis: FamousGrow uses a working nominal PPF of 1,642 µmol/s, derived from the actual Samsung LM301Z+ 5000 K / 2700 K component configuration and operating point. This is not an integrating-sphere fixture measurement. PPFD values remain nominal photon-budget estimates and do not account for all mounting-height, room-edge, reflection, or canopy-distribution effects. Verify final canopy PPFD with a calibrated PAR meter.