Buying LED grow lights for your first plants? Start with where the pots will stand. A seed tray tucked under a shelf needs a slim light above it. A bench where you plan to keep taller plants gives you room to hang a panel and raise it as they grow.
On the shelf, the two slim tubes in the TheOneGrow T8 set can sit side by side, one over each row of seedlings. Above the pepper, the MA2000 200 W LED Grow Light gives you a different kind of control. Hang the board from an adjustable support and you can raise it as the plant grows or dim it while the plant is small.
This guide helps you choose between tube lights for a seedling shelf and a hanging board for a growing bench. Using South African prices, we compare what fits a R2,000 budget, how to check the light reaching your outer pots and how much a 400 W light adds to your monthly bill compared with a 200 W model.
How much space do your LED grow lights need to cover?
Measure the space occupied by the leaves. On a 120 cm bench holding one 50 cm seedling tray, start with the tray dimensions. For herbs that stay until harvest, space the pots as they will stand when you pick the leaves.
On a shelf, allow for the plug.
Measure between the uprights and above the tallest leaves. A 55 cm tube can fit a 60 cm opening while its connector catches on the side. Try a cardboard strip of the same length, then pull the tray out.
Over a bench, check how high the light can hang.
Put the tallest pot under the fixing point. Allow for the hangers, future growth and the recommended lamp-to-leaf distance. Check you can reach the adjuster with the bench full.
Beside a window, find the shaded row.
Look at the back pots at different times of day. One shaded row may need a tube of its own. In a windowless room, your LED grow lights need to cover the entire planted area.
If you are ordering a light as a gift, ask the grower for a photo from the side as well as one from above. A top view shows how far the pots spread. The side view shows whether there is a shelf immediately above them or room to hang a panel.
Which fixture makes sense for a shelf, a bench or a wider canopy?
Two shallow rows of seedlings · TheOneGrow T8 set
Tube-style LED grow lights let you position one 55 cm tube above each row. You can then slide either tray forward for watering. The two 10 W tubes are an economical fit for a shelf that will keep doing the same job after this batch moves outdoors. Check the selected variant carefully. Our November listing check recorded R520 for the set and R80 for a separate power cord.
If you plan to add another shelf later, you can put a second pair of LED grow lights under that shelf when you need them. If you plan to move the plants onto a bench instead, put your money towards the light you will use there. Think about where the pots will stay for most of the season before buying a set for their first few weeks.
A small plant bench on a R2,000 budget · TheOneGrow MA2000
TheOneGrow MA2000 is a 200 W dimmable panel priced at R1,900. Choose it if your plants share one bench and you want to keep the same light as they grow. You can turn it down for a new batch of small plants. On a R2,000 budget, that leaves R100 for any delivery or hanging accessories you still need.
A wider planted bench · TheOneGrow MA4000
TheOneGrow MA4000 costs R3,780. This 400 W panel is worth considering when plants already fill a wide bench and the pots along the sides also need light. Compared with the MA2000, it costs R1,880 more. Ask the seller which panel covers your full bench at the height you can hang it. If the MA2000 already reaches every pot, keep the difference.
| If you grow on… | Start with | Check before buying |
|---|---|---|
| A shallow shelf with two seedling trays | T8 2 × 10 W tube set · R520 | Allow room for each 55 cm tube and its connector. Select the two-lamp kit with power. |
| A hanging bench with a R2,000 budget | MA2000 200 W LED Grow Light · R1,900 | R100 remains for extras. Check the mounting hardware and the light map at your usable height. |
| A wide bench planted to its edges | MA4000 400 W LED Grow Light · R3,780 | Consider the R1,880 upgrade only if a comparable light map shows enough light at your outer pots. |
How can you tell whether the outer pots will get enough light?
To compare coverage from two LED grow lights, find the squares on each PPFD map where your outer pots will stand. Those readings tell you how much light reaches the leaves at the edge of the bench.
Match the test conditions.
Check the measured area, lamp height, dimmer setting and whether the test used reflective tent walls. A reading inside a tall tent may tell you little about a low, open shelf.
Read across to the outer row.
Suppose two maps both show 400 µmol/m²/s at the centre. At the edge, one reads 240 and the other 120. Under matching conditions, the first delivers twice as much light at that spot. Whether it is enough depends on your crop and daily lighting hours.
Comparing LED grow lights by watts and PPF
Watts tell you the electrical input and PPF gives total photon output. Neither locates the light on your bench. Ask for a map at your hanging height before paying extra for edge coverage.
You can ask a much simpler question than the numbers on the chart suggest. Tell the seller where your last pot stands: for example, a hand’s width inside the left edge of your bench. Ask them to point out that spot on the chart. Repeat for the other end before choosing a larger lamp.
How do monthly running costs compare for 200 W and 400 W LED grow lights?
At full rated power for 12 hours a day over 30 days, a 400 W LED grow light uses 144 kWh and a 200 W light uses 72 kWh. The difference is 72 kWh a month, or R216 at an illustrative R3/kWh. For your own bill, multiply 72 by your applicable rand rate per kWh.
To budget for LED grow lights, use the charge for an additional unit of electricity on your household tariff. One unit is one kilowatt-hour. Divide the fixture’s input watts by 1,000, multiply by the daily hours, then by the number of days. Multiply that result by your rand price per unit. The example below uses twelve hours a day for thirty days and a hypothetical R3 per unit. Use the schedule suitable for your plants and the rate applicable to your account when you make the purchase decision.
| Fixture | Listed price | Monthly energy at full input | Example energy cost |
|---|---|---|---|
| T8 2 × 10 W | R520 | 7.2 kWh | R21.60 |
| MA2000 200 W | R1,900 | 72 kWh | R216 |
| MA4000 400 W | R3,780 | 144 kWh | R432 |
First-year difference at full power: R4,472
At the example tariff, R216 extra per month adds up to R2,592 over twelve identical months. Add the R1,880 purchase premium. Delivery and installation are additional.
How much electricity do dimmed LED grow lights use?
Measure one normal lighting cycle with a compatible plug-in energy meter. Use the measured kWh to compare costs at the setting you expect to use.
Adding another tray later?
A second tray alongside the first may fit within the existing light footprint. A second shelf needs its own fixture and power connection. Price the specific expansion you have in mind.
Conclusion
Choose LED grow lights for the space your plants occupy. For two seedling trays on a shallow shelf, the T8 2 × 10 W LED Grow Light set at R520 lets you put a tube over each row. Check that each 55 cm tube fits with its connector. For a bench where taller plants need an adjustable hanging light, the MA2000 200 W LED Grow Light at R1,900 leaves R100 of a R2,000 budget for any mounting hardware.
For a wider bench, consider the MA4000 400 W LED Grow Light at R3,780 if the outside row needs more light. Before paying the extra R1,880, compare the edge readings at your hanging height. Visit TheOneGrow to explore grow light models and check current prices.
Frequently asked questions
Do I need dedicated LED grow lights for one indoor plant?
An ordinary white LED bulb can supplement daylight if enough light reaches the leaves. For one houseplant beside a window, first see whether you can position the bulb close enough to supplement the shaded side while following its fitting instructions. For a full tray in a dark room, a fixture with coverage data is easier to size.
Can full-spectrum LED grow lights carry peppers through fruiting?
The label describes the range of wavelengths a lamp emits. Fruiting also depends on the amount of light that reaches the canopy over the day. Ask for readings at the height your mature plant allows and compare them with the needs of the crop before relying on that lamp as its main source.
If I buy the 400 W board now, can I run it like a 200 W light?
You can reduce output on a compatible dimmable board. Measure the actual input at the chosen setting if the electricity bill matters. Even when two fixtures draw the same power, their physical size and light distribution can differ, so check coverage over the plants as well.
Can one fixture light two shelves if I leave gaps between the trays?
Some light may pass between trays, but plants on the lower tier sit behind the upper leaves, pots and shelving. For an occupied two-tier rack, plan a light for each planted level. Include both fixtures and their power connections when comparing the total purchase price.
What should I ask a South African seller before ordering LED grow lights?
Before ordering LED grow lights, give the seller two measurements: the width of your planted area and the height available above the pots. Ask which model suits that spot. Then check whether the price includes hangers and delivery to your postcode. This is especially useful on a R2,000 budget, where even a small delivery charge can change your choice.