In professional cultivation, lighting is the most leveraged input. It dictates canopy structure, yields, cannabinoid and terpene profiles, and ultimately, business margins. Flexstar’s Redline Series was engineered to meet the highest standards of modern commercial growers — not by incremental change, but by rethinking optics, thermal management, and spectral control from the ground up.
The Redline Series is the result of two parallel goals: boost photon efficiency far beyond most LED fixtures on the market, and maximize durability so fixtures deliver consistent, predictable performance for years. The breakthrough that makes both possible is Flexstar’s proprietary Liquid Optics System (LOS) — a world-first solution that transforms how light is produced, distributed, and preserved in demanding grow environments.
1. Why We Created the Redline Series
We built Redline for professional growers who require three non-negotiables:
Higher photon efficiency — more usable photons per watt than legacy systems.
Greater durability — optics, thermal systems, and housing engineered to resist degradation and maintain output over years.
Versatility for every workflow — from fixed-spectrum reliability to fully tunable light recipes.
The industry has seen many fixtures that advertise high μmol/J on spec sheets, yet real-world efficacy drops under heat, humidity, and long runtimes. We wanted to close that gap. So we invested heavily in a fundamental optical innovation (LOS) and upgraded every subsystem — diodes, thermal paths, mechanical design, and control integration — to deliver a product line that outperforms in photon delivery and longevity while offering the operational flexibility pro growers demand.
Key intentions behind Redline:
Replace optical and thermal weak points that limit long-term efficiency.
Raise sustained photon flux in real grow conditions (not just lab numbers).
Offer two distinct product families (fixed and tunable) for different cultivation philosophies without sacrificing reliability.
2. The Breakthrough: LOS (Liquid Optics System)
The Liquid Optics System is the cornerstone of Redline. LOS is a proprietary optical architecture that uses a precision-engineered liquid medium to refract, diffuse, and channel photons more effectively than traditional solid lenses.
How LOS delivers what growers actually need
Boosted real-world photon efficiency: LOS reduces optical losses and keeps more PAR where plants can use it. That raises practical photon delivery in operational grow rooms.
Superior thermal stability: The liquid layer channels heat away from LEDs, smoothing junction temperatures and preventing the output degradation commonly caused by thermal stress. Stable junction temps translate to sustained output and longer diode life.
Long-term optical clarity: LOS resists yellowing and optical drift that plague polymer lenses in humid, hot environments. That means the Redline’s light field stays consistent season after season.
Exceptional canopy uniformity: LOS shapes the light for even PPFD across the canopy and improved penetration to lower leaves — important for high-density racks and multi-tier facilities.
Developing LOS required multi-disciplinary R&D — materials science, fluid dynamics, optical modeling, and precision manufacturing. The result is an optical platform that is unique to Flexstar and purpose-built to meet pro growers’ expectations for both efficiency and durability.
3. The Redline Family — Two Models, One Foundation
The Redline Series comes in two purpose-driven models that share the LOS core:
1) Flexstar Redline — Full Spectrum Powerhouse
Designed for growers who require scalable, reliable performance with minimal complexity.
Who it’s for: Large commercial facilities, multi-bay operations, growers who prefer a set-and-forget, high-output solution.
Core strengths:
Optimized full spectrum tuned for balanced vegetative and flowering performance.
Consistent PPFD across canopy thanks to LOS shaping.
High sustained photon delivery in production environments.
Why choose the Redline: If you want maximum usable light per watt with rock-solid longevity and minimum operational fuss, the Redline is engineered for that outcome.
2) Flexstar Redline SpecTune — Tunable Spectrum Masterclass
Built for cultivators who need scientific control over plant responses — breeders, R&D facilities, craft cultivators, and high-margin commercial rooms.
Who it’s for: Teams that run trial recipes, adjust spectra per strain, or optimize secondary metabolite profiles through light recipes.
Core strengths:
Independent multi-channel control (White / Deep Red / Far Red / UV) with 0%/25%–100% per-channel granularity.
Recipe-driven programming for repeatable growth protocols.
LOS-driven uniformity plus tunability — meaning tunable performance without sacrificing optical clarity or efficiency.
Integration-ready with controllers and data systems for centralized management.
Ideal for terpene and cannabinoid optimization where spectral nuance matters.
Why choose the Redline Spectune: If your operation relies on spectral recipes, experimental runs, or premium product differentiation, the Redline Spectune delivers tunable precision with the durability and efficiency you expect from the Redline.
4. Durability, Serviceability, and ROI
We know pro growers measure ROI across many seasons. the Redline series was engineered to reduce total cost of ownership:
Extended lifetime performance: LOS preserves optical performance; elevated thermal control protects diodes.
Lower maintenance: Durable optics and sealed housings mean fewer cleanings, replacements, and service calls.
Scalable control systems: Standardized interfaces simplify networked control across hundreds of fixtures.
Predictable output: Stable light delivery reduces crop variance and supports predictable production planning.
When you total up higher usable photon output, less fixture degradation, and simplified operations, the Redline series improves both yield potential and operational certainty.
Conclusion — For Growers Who Demand More Than Promises
The Flexstar Redline Series isn’t an incremental refresh — it’s a systems-first re-engineering of how horticultural lighting should perform in real commercial environments. We developed LOS to boost efficiency and durability, upgraded photon delivery to outpace the classic PRO series, and added features that increase versatility and support professional workflows.
If you run a commercial facility and require lighting that delivers more usable light, greater longevity, and precise control, the Redline family gives you choices without compromise: the Redline for dependable, scalable power, and the Redline Spectune for research-grade spectral command.
Flexstar Redline — engineered to give pros the photons, the stability, and the control they need to grow with confidence.