What Information Should You Send a Grow Light Supplier to Get an Accurate Quote?

Why a complete inquiry beats a perfect specification

You do not have to be a lighting engineer to request a good quote. A message that says only "I need LED grow lights for my greenhouse" forces the supplier to either quote a generic kit or reply with a long question list — both delay the quote, and the generic kit can quietly drift away from what your crop actually needs. The real cost of missing information is not a single wrong number; it is a quote built on assumptions you never saw, which then becomes the basis for a purchase you cannot easily unwind.

The purpose of the request is to hand the supplier the project so they can do the engineering: convert your crop target into a canopy PPFD, translate your area and racks into a fixture count, and match spectrum and controls to how you actually grow. You supply the facts about your operation; they supply the photon math and the bill of materials. A well-formed inquiry simply makes that translation unambiguous.

The information that drives an accurate quote

• Crop and growth stage — what you grow and at which phase, because light demand differs sharply between seedlings, leafy greens, vine crops and flowering plants.
• Growing area and rack geometry — total canopy area, shelf or bench dimensions, rack depth and tier clearance.
• Mounting height — the distance from fixture to canopy, which sets beam spread and uniformity.
• Natural-light baseline — whether the space is indoor sole-source or a greenhouse with sunlight, and how much supplemental light you already need.
• Electrical supply — voltage, phase, available watts per circuit and breaker capacity.
• Quantities and rollout — how many fixtures now and whether the project phases in over time.
• Target market and standards — the country or region of use, which guides the certifications and labels the supplier should quote.
• Control needs and timeline — dimming, scheduling, sensors, and your required delivery date.

How each piece of information changes the quote

Every item above maps to a specific line in the quote. The table below shows what each piece of information sets, and what happens if you leave it out — so you can decide what is worth measuring now versus what you can mark "to be confirmed" and let the supplier propose.

Crop and growth stage: the number that anchors everything

The single most useful thing you can tell a supplier is what you grow and at what stage, because light demand is set by the crop, not by the room. In controlled-environment agriculture the daily light integral, or DLI — the total photosynthetically active photons a canopy receives per day — is the figure that drives a lighting plan. University extension guidance ties crop quality directly to DLI: Michigan State University Extension reports that plants grown under a DLI below 10 mol·m⁻²·d⁻¹ develop fewer roots and less shoot growth and can take up to twice as long to reach transplant size, and the e-GRO transplant guide (Owen, Ohio State University, 2025) places the optimal vegetable-transplant DLI at 10–15 mol·m⁻²·d⁻¹, with heavier feeders such as eggplant at 15–20. The supplier turns that crop target into a required PPFD and then into a fixture count — the worked example in our article Sizing LED Grow Light Count for a Commercial Seedling Rack shows exactly how that chain runs.

Growing area, rack dimensions and mounting height

Area sets the count; rack geometry sets the form factor. Rack depth (the front-to-back shelf dimension) and tier clearance (the gap to the shelf above) decide whether linear bars or flat boards fit and spread light evenly — our companion article LED Grow Bars vs Panels for Vertical Farms: Rack Depth and Tier Clearance explains why geometry beats wattage for this choice. Mounting height then sets uniformity: commercial layout guidance cited by LED Grow Lights Depot reports roughly 20–30 percent PPFD change per 5 cm of height error at multi-tier distances, so a 30 cm-grid map after install is the real check. For low-clearance racks our Propagation & Rack Grow Lights and Foldable LED Bars are the fixtures we specify; for open high-ceiling zones the Quantum Board range fits.

Natural-light baseline: greenhouse vs indoor

Whether your space is indoor sole-source or a greenhouse with sunlight changes the entire fixture family. A greenhouse rarely needs full sole-source lighting; it needs supplemental light to close a DLI gap, and glazing transmission loss is large — Michigan State University greenhouse energy guidance notes that greenhouses transmit only a fraction of outdoor light and can lose 60 percent or more through the structure. That loss, plus seasonal and latitude variation, is why a greenhouse quote is fundamentally different from an indoor one. Our Greenhouse Top Lighting and Supplemental Spectrum Grow Lights ranges are built for that supplemental job, and the greenhouse applications page lays out crop-specific starting points.

Electrical supply and controls

Tell the supplier the voltage and phase available where the fixtures will hang — common values are 120 V single-phase, 208/230 V, and 277 V or 480 V in larger commercial sites — plus the watts available per circuit and the breaker rating. This determines driver type and whether any transformers or special wiring are needed, and it is far cheaper to specify correctly than to correct a voltage mismatch in the field. Controls matter too: dimming (0–10 V or PWM), day-length scheduling, and environmental sensors change both the controller bill of materials and the per-fixture price. If you already run an environment controller, name it so the supplier quotes a compatible interface rather than a closed system you cannot integrate. For humid spaces such as greenhouses and propagation rooms, also state the ambient humidity and any wash-down or IP-rating expectation, because that changes the fixture enclosure and connector specification.

Quantity, target market and timeline

Quantity drives the price tier and the minimum order quantity, and a phased rollout (a pilot batch now, expansion later) changes how the supplier schedules production and holds consistency between batches. The target market decides which certifications, plugs, labels and documents the quote should include — a fixture bound for North America, the EU and the Middle East carries different compliance paperwork, and your supplier should quote the right set rather than a generic one. Finally, your required delivery date sets the production slot and the shipping method; without it the supplier cannot promise a date and may default to the cheapest freight, which may miss your window.

A copy-paste inquiry template

Copy the checklist below into your message. Fill the fields you know and write "TBD — recommend" for anything you are unsure about; the supplier should state the assumptions they make for those items so you can confirm them before ordering.

What to do when you are unsure about a value

You are not expected to walk in with a finished lighting design. Where you do not know a value — a target DLI, the exact mounting height, the available watts — write "TBD — recommend" and let the supplier propose an assumption, then confirm it. The supplier's job is to turn partial information into a defensible layout, not to punish you for gaps. What you should avoid is inventing a number to look complete; a wrong assumption is harder to unwind than an explicit question. When you are ready, send the template to our team through the contact form and we will return a layout with the assumptions stated up front.

Map your project to LUMAGROW ranges

Once we have the project facts, we match them to the right fixture family: Propagation & Rack Grow Lights for tray-level seedling and clone racks, Foldable LED Bars for low-clearance multi-tier racks and benches, Quantum Boards for open high-ceiling zones, and Greenhouse Top Lighting with Supplemental Spectrum for sunlight top-up. For crop-specific layouts see our greenhouse, vertical farming, indoor growing and propagation application pages. Each inquiry returns a per-zone fixture count, a layout, the spectrum and a PPFD-map plan, with OEM and ODM options for brands and distributors.

Frequently asked questions

Sources

• e-GRO / Ohio State University — Managing Daily Light Integral to Improve Vegetable Transplant Quality (Owen, 2025) — optimal transplant DLI 10–15 mol·m⁻²·d⁻¹, crop-specific ranges (eggplant 15–20).
• MSU Extension — How Low Can You Go? Low DLI Impacts Young Plant Quality (Wollaeger & Runkle, 2014) — DLI below 10 mol·m⁻²·d⁻¹ reduces roots and shoot growth and can double production time.
• MSU Extension — Greenhouse Energy Conservation Strategies (Runkle et al.) — DLI concept and greenhouse transmission loss of 60 percent or more.
• Purdue Extension — Measuring and Interpreting Daily Light Integral (Torres & Lopez, HO-238) — the standard extension reference for DLI measurement and the PPFD-to-DLI relationship.
• LED Grow Lights Depot — Commercial Grow Room Lighting Layout — 30 cm measurement grid, 10–20 percent overlap, mounting-height sensitivity.