Fluorescent versus LED grow lights: keep or replace?

This guide combines source-based research with practical arrangement advice. We have not conducted hands-on product tests.

Document what you have

Record the current fixture, tube type, number of tubes, mounting height, schedule, and actual input power where available. Include the ballast in the electricity comparison rather than adding tube labels and assuming that is the whole draw. Note which parts are replaceable and whether compatible replacements are available.

Then write down the problem you want to solve. Perhaps the fixture is failing, its arrangement no longer fits the plants, or you want a different routine. If you cannot identify a problem and the installation remains appropriate, replacement may be a low priority. Keeping a working setup while researching the next one can be sensible. A useful upgrade should have a purpose you can evaluate rather than depend entirely on the appeal of a newer product category.

Record fixture model, lamp type, total input draw and the arrangement it covers. Note replacement-lamp requirements and which mounting parts belong to the fixture. A working installation has practical value that a product comparison should acknowledge.

Do not assume an LED tube is a drop-in replacement for a fluorescent tube. Socket appearance does not establish ballast or wiring compatibility. Use only combinations explicitly supported by the relevant manufacturer; this guide does not recommend rewiring.

Plant and topic guidance

Compare complete costs

Compare the complete purchase price with the likely electricity difference. As an illustration, changing from an actual 80W setup to an actual 40W setup saves 0.04 kW while operating. At fourteen hours daily for thirty days and an assumed $0.15 per kWh, that saves $2.52 per month.

A hypothetical $60 net replacement cost would take about twenty-four months to recover through that electricity saving alone. These are example numbers, not measured power or prices for the fixtures linked here. Use your own values and include replacement parts, mounts, and the schedule you actually follow. If you only run the station seasonally, calendar payback is longer than a calculation based on continuous monthly operation.

Check the proposed coverage

A replacement needs to serve the same growing area at an appropriate height. Compare distribution and available measurements over that footprint rather than matching wattage or choosing the highest center value. Keep the measurement conditions with each map so the comparison remains meaningful.

Check installation compatibility before choosing a retrofit product. Do not assume that an LED tube is suitable for every fluorescent fixture or ballast, and do not improvise wiring changes from a shopping recommendation. A complete purpose-built fixture may simplify the replacement decision when the existing assembly is unsuitable. Choose the documented installation route and include its full cost, then evaluate whether the new arrangement provides the improvement you wanted.

Compare available maps or measurements at the intended mounting distance. A new fixture may fit differently and illuminate a different footprint. Do not assume a spectrum label proves it can replace your current arrangement.

Keep manufacturer specifications and biological claims separate. Iowa State Extension supports the measurement terminology, while your actual fixture documents must support electrical compatibility and output. We have not tested comparative growth results.

Choose a fixture that suits this job

Barrina T5 shelf-bar family

For a compact shelf, the Barrina T5 one-foot, white-cover four-pack is our modular option to compare. Separate bars let you plan their positions around a row of pots or a small tray, rather than placing one spotlight over the middle. The selected listing includes connecting cords and several mounting components, and describes a 20W total across the four bars. Use the exact pack when checking what you need.

This version is non-magnetic; other Barrina listings have different covers and attachment systems. Choose mounting hardware suited to your shelf and follow the surface restrictions in the instructions. For instance, tape has a different job on a smooth panel than on a wire rack. We favor these bars when flexibility in arranging a small shelf matters. The tradeoff is more individual pieces and cables to organize. Do not assume that four bars automatically cover a particular tray: check the intended mounting distance, distribution, and plant requirements before deciding how many to install.

Manufacturer specifications

View Barrina T5 shelf-bar family on Amazon (paid link)

Spider Farmer SF600

The Spider Farmer SF600 is the longer, integrated fixture to compare for a rectangular growing area. We recommend its form for buyers who would rather hang one long assembly than arrange several separate short bars. That can simplify the physical layout above trays, provided the fixture and hanging hardware fit inside the available space.

Allow room for the power supply, cable exits, and raising or lowering the fixture. Check the current package and its controls instead of assuming it includes a dimmer or timer. External reviews discuss earlier SF600 versions, and the currently observed listing gives different power wording from older documents. For that reason, confirm the current model's input draw before calculating cost, and use its current instructions for mounting. The benefit is the tidy rectangular arrangement; the limitation is that a long fixture is less adaptable to an isolated pot or a narrow furniture corner. A staged product photograph does not establish uniform light across its entire pictured display.

Manufacturer specifications

View Spider Farmer SF600 on Amazon (paid link)

Make the setup easy to use

Evaluate a complete arrangement

A good comparison includes the lamp, its mount, the space it occupies, and the routine you will use. Put your proposed fixture into a simple sketch showing the foliage, shelf edges, cord route, and access for watering. Include room to make adjustments. A fixture that technically fits can still be inconvenient when its switch is behind the plants or its cable crosses the area where you lift containers.

Compare two options using the same growing footprint and available mounting height. Keep the model, revision, and controls with any published measurements. If one map was made closer to the light or inside reflective walls, it is not a direct comparison with a map made farther away on an open shelf. Ask for missing conditions before treating a large headline number as useful evidence.

Separate light quantity from power use

PPFD describes light arriving at a surface, while watts describe electrical input. Both are useful, but they answer different questions. Record readings where the leaves sit and look at several positions across the display. A lamp can have a high center reading without distributing that light in the shape you need. Published PPF is overall output; it does not establish a particular leaf-level reading.

For a constant reading, DLI equals PPFD multiplied by daily hours and 0.0036. An illustrative 100 µmol/m²/s for twelve hours therefore gives 4.32 mol/m²/day. This is arithmetic, not a plant recommendation. Changing daylight requires measurements over time, so one noon window reading should not be multiplied by the entire day. Keep biological guidance separate from the calculation.

Include the ongoing expense

A hypothetical 30W light running twelve hours daily for thirty days uses 10.8 kWh. At an assumed $0.15 per kWh, that is $1.62 for the month. Use actual input power and your own tariff, then add mounts, compatible bulbs, and any timer to the upfront comparison. A cheaper lamp that needs additional fixtures may become a more expensive complete setup. Decide what meets the task before deciding which price looks best.

Decide whether to keep, repair, or replace

For a working fluorescent station that still fits the growing area, start with maintenance requirements and the actual running cost. If replacement parts are suitable and the arrangement remains useful, keeping it may be the simplest decision. You do not need to replace an entire station solely because other products use LEDs.

For a failing or inconvenient station, compare complete LED fixtures. Short Barrina bars offer modular placement; a longer SF600 assembly offers a different overhead layout. Match the current growing footprint and available headroom before pricing either option. The selected bars are complete lights, not tubes promised to fit your old fluorescent hardware.

For a station you want to enlarge, treat the expansion as a new layout. A larger fixture might simplify it, but several smaller pieces may suit separate growing areas better. Include the mounts, controls, and full power draw. Choose the arrangement that solves the access or distribution problem, then calculate the ownership cost. The better purchase may be worthwhile for convenience even when electricity savings alone would take a long time to recover the price.

Our recommendation

Keep a suitable working fluorescent setup when it still meets the task and its maintenance makes sense. Compare an LED replacement when it offers a defined improvement in fit, operation, or documented distribution, or when the existing equipment needs replacement.

Use actual system power and the complete purchase cost for the financial comparison. Check mounting and electrical compatibility before ordering, and avoid treating equal wattage as equal plant-level light. A thoughtful upgrade is one whose purpose and cost you can explain. The technology name on the box is a starting point for research, not the verdict.

When you are ready to compare listings, consider Barrina T5 1FT white-cover four-pack (paid link) for a modular compact shelf; Spider Farmer SF600 (paid link) for a longer rectangular growing station. Check the selected version and included components before ordering.