If your plants are entering flowering, should you replace the white main lamp with a red flowering fixture? Before buying more full spectrum LED grow lights, work out whether you need a different spectrum, more delivered light, or a clearer understanding of your existing equipment.
A suitable broad-spectrum main lamp can serve more than one growth stage. Our MA400 400W Grow Light and GLOC720 720W Grow Light both combine white and red LEDs and are described for vegetative growth and flowering. That gives you a reason to keep them under consideration rather than automatically ordering a separate red fixture.
For a dedicated high-light growing area in South Africa, including cannabis, check whether the main installation still suits the developed canopy. This guide separates keeping, adjusting and replacing full spectrum LED grow lights, rather than buying another lamp for a changed stage name.
Check what your current main lamp already provides
Read the exact model description. White-looking light may already include red LEDs. A photograph cannot establish delivered light or independent colour control.
MA400's description lists white and red LEDs for both growth and flowering. Its output adjustment uses four settings: 25%, 50%, 75% and 100%. Those settings adjust the lamp's output. They do not establish that you can change the red proportion independently. That is an important distinction when comparing full spectrum LED grow lights with advertisements for selectable spectrum modes.
GLOC720 uses white and red LEDs, with 0–100% output adjustment. Its description does not confirm independent red-channel adjustment. Buy it for the documented main lighting and controls.
There is also a practical advantage to retaining white light when inspecting plants: leaf colour and the working area are easier to see than under strongly coloured illumination. Fluence's discussion of broad and narrow spectra explains the value of broader white lighting. It does not prove that either of our models will produce a particular yield.
If your full spectrum LED grow lights already provide a suitable white-and-red blend, the next question is how well that light reaches the plants. Ordering a red lamp before checking this can leave the original problem unchanged.
Separate a spectrum question from a coverage problem
Plants occupying more space can require reassessing the installation. That does not automatically mean the spectrum is wrong.
Check the edges as well as the centre. Uneven light may call for a different layout rather than another colour. Choose around the occupied canopy, rather than a pot count.
For full spectrum LED grow lights, request a light-distribution map at an installation height you can actually use. Check that it identifies the fixture, test area and output setting. A single bright reading directly below the lamp cannot show how evenly the entire area is served.
The University of New Hampshire's indoor-lighting Q&A explains that distance changes intensity and that useful daily light depends on both intensity and duration. For buying equipment, the implication is to examine the installed lighting rather than diagnose a colour deficiency from appearance alone.
If the current arrangement is suitable, retain it. If the available hanging position or spread is the problem, first consider a layout adjustment. Replace full spectrum LED grow lights when the present equipment cannot meet the actual task; avoid replacing them simply to follow a stage label.
Use MA400 and GLOC720 for different installation needs
These are main-light candidates for a dedicated growing area, rather than an automatic recommendation for a few kitchen herbs. The useful comparison is the fixture you can install and the light distribution your developed canopy needs.
| Main-light candidate | Published fixture facts | When to consider it | Before choosing |
|---|---|---|---|
| MA400 400W Grow Light | R3,780; 60 × 48 × 6cm; four output settings | A dedicated area where a board fits and adjustable main lighting meets the task | Confirm usable hanging space and a distribution map for the occupied canopy |
| GLOC720 720W Grow Light | R4,999; 105 × 108.5 × 4.2cm; 0–100% output adjustment | A wider installation with room for a bar frame and a demonstrated need for its main lighting | Check frame clearance, support and distribution at the intended height |
Both full spectrum LED grow lights are described for growth and flowering. The table does not identify one as a vegetative lamp and the other as a flowering lamp. It also gives fixture dimensions, not guaranteed crop coverage or a prescribed plant count.
For example, a 105 × 108.5cm frame cannot fit horizontally inside a 90 × 90cm footprint. The 60 × 48cm board is smaller, but fitting inside does not prove adequate canopy lighting. Dimensions can exclude a fixture; they cannot alone approve it.
For a greenhouse, also account for daylight and the area needing supplemental illumination. A main lamp used in a light-excluding room and the same lamp supplementing daylight are different projects. Compare full spectrum LED grow lights using the lighting contribution you need, not an identical wattage target for both locations.
Compare the cost of keeping, adjusting and replacing
Keeping a working fixture costs less upfront than buying another one. That is sensible only if the existing lamp can still do the job. Conversely, a larger replacement has value when it resolves a demonstrated shortfall, not merely because its wattage is higher.
The models differ by R1,219 before installation changes. Replacing an owned MA400 means paying for the new lamp, rather than just that difference, unless there is an actual trade-in. Account for the old equipment's value separately.
Running costs also depend on measured input and actual operating time. As an illustrative calculation, 400W for 10 hours uses 4kWh, while 720W for the same time uses 7.2kWh at those inputs. This is a cost comparison, not a recommended flowering schedule. Multiply the energy by your own electricity rate; dimmed consumption needs its own input reading.
Before ordering full spectrum LED grow lights, choose between three actions:
- Keep: the present main lamp serves the occupied area and offers the control you need.
- Adjust: placement or output needs changing, and the existing equipment can make that change safely within its instructions.
- Replace: the current installation cannot supply the required lighting, and the proposed model has evidence for the new arrangement.
Buy additional capability when it has a job.
Conclusion
If your full spectrum LED grow lights in South Africa already combine white and red light and suit the developed canopy, entering flowering is not, by itself, a reason to replace them. Keep MA400 where its installation works. Consider GLOC720 for a wider dedicated area only when its layout and available output solve a real need.
For a project that needs the larger bar format, compare the GLOC720 720W Grow Light with your installation requirements. Check fit and distribution before committing. Choose full spectrum LED grow lights around the completed growing area, with a clear reason for retaining or replacing the current main lamp.
Frequently Asked Questions
These questions distinguish a useful upgrade from a second lamp bought only for a different stage name.
Do flowering plants always require a separate red lamp?
No. A suitable main lamp can already include red light alongside white light. Both models discussed here are described for growth and flowering. Whether the installation is adequate still depends on the crop, occupied area and delivered light; the presence of red LEDs alone does not answer that.
Does MA400's dimmer change the spectrum?
The documented function is output adjustment through four settings. It is not described as an independent red-channel control. If changing the spectrum separately is essential to your project, ask for explicit channel specifications before buying equipment for that purpose.
Is a 720W lamp suitable for every grow tent?
No. The frame dimensions alone exclude some smaller spaces. Even in a tent that can contain the frame, check hanging clearance, access, airflow and light distribution. A high power figure does not establish that the equipment fits or that plants at the edges receive suitable light.
Should I buy a bigger lamp when my canopy gets wider?
Reassess the occupied area. Compare a layout adjustment with replacement, using evidence at a usable height. More pots alone do not establish the right purchase.