The short answer
Compare LED modules using the same sample letter, face material, return depth, power supply loading and camera exposure. Judge face uniformity, useful brightness, module count, heat, documentation, warranty terms and replacement availability together. Do not select a module from lumen output, warranty length or pack price alone.
Nine criteria that matter in a professional comparison
A datasheet is the starting point, not the verdict. Use it to shortlist products, then confirm how those numbers translate into a finished letter.
| Criterion | What to verify | Why it matters |
|---|---|---|
| Light output | Lumens per module, measured for the chosen colour temperature | Determines useful output, but not uniformity on its own |
| Optical distribution | Beam angle and lens pattern | Controls spread, spacing and hotspot risk |
| Efficiency | Lumens per watt and total system load | Affects power-supply sizing, heat and running cost |
| Module geometry | Body size, cable exit and fixing area | Determines fit in narrow strokes and tight returns |
| Environmental rating | Declared IP rating for the complete module | Must suit condensation, rain exposure and cleaning conditions |
| Colour quality | CCT tolerance and batch consistency | Prevents visible colour differences across letters or replacement work |
| Compliance evidence | CE and RoHS documentation for the supplied product | Supports professional procurement and project records |
| Warranty | Written term, exclusions and claim route | Reduces uncertainty only when support is practical |
| Supply continuity | UK stock, technical help and replacement availability | Matters when a project expands or requires service later |
How to compare LED module brands fairly
Searches often frame the decision as one brand against another — for example HanleyLED versus AgiLight, Principal LED versus another range, or a manufacturer brand versus a distributor's own product. That comparison is only useful when equivalent products and equivalent evidence are placed side by side.
Match voltage, colour temperature, environmental rating and intended application first. Then compare the current technical sheets, written warranty and local supply arrangement. A warm-white high-output module should not be ranked against a cool-white compact module as if both were designed for the same letter.
Supplier availability also changes by region and over time. For UK sign makers, a module that can be tested, reordered and supported locally may reduce project risk even when a competing datasheet appears similar.
A repeatable workshop test
A small controlled test is more valuable than an uncontrolled wall photograph. Build one representative letter or test box and record the setup so the result can be repeated.
For the complete fabrication workflow, use our step-by-step channel-letter LED module installation guide.
- 1
Fix the geometry
Use the production return depth, stroke width, internal finish and face material.
- 2
Create comparable layouts
Start from each supplier’s spacing guidance, then adjust only to achieve acceptable uniformity.
- 3
Control the electrical test
Use the correct constant-voltage supply, sound connections and a documented load with suitable headroom.
- 4
Evaluate the illuminated face
Check hot spots, dark edges, shadowing around returns and brightness consistency across the viewing angle.
- 5
Record evidence
Lock camera exposure, note module count and power, and keep photographs with the job specification.
- 6
Run a heat check
Allow the sample to stabilise and confirm that modules, wiring and power supply operate normally in the intended enclosure.
Match the module to the letter — not the brand name
Shallow or narrow letters
Prioritise compact geometry, controlled output and wide optical distribution. More output can make hotspot control harder when the face is close to the lens.
Deeper or broader letters
Higher useful output may reduce module count, but edge coverage and spacing still need a physical test.
Outdoor signs
Choose the environmental rating for the exposure and installation design. Seal cable entries, manage drainage and protect the power supply as a complete system.
Warm or cool white
Select colour temperature for the face material and brand intent, then keep one specification and production batch across the sign.
For deeper guidance on layout variables, read how to choose LED modules for channel letters. For external installations, use the IP65, IP67 and IP68 guide alongside the product documentation.
Compare the true installed cost
Pack price is easy to compare and easy to misuse. A better commercial calculation is:
If one option needs fewer modules but a larger power supply, or saves material but takes longer to place around tight strokes, the finished job may not follow the pack-price ranking. Calculate the complete sign before deciding.
Glowfy K2 PRO and K8 PRO: two different specification points
Both ranges use Philips 2835 LED chips and are specified for professional illuminated signage. The correct choice depends on the required output and letter geometry.
GL K2 PRO
- Philips 2835 LED chips
- 12V DC · 0.72W · 70 lm per module
- 170° beam angle · IP68
- CE and RoHS documentation · 5-year warranty
GL K8 PRO
- Philips 2835 LED chips
- 12V DC · 1.2W · 120 lm per module
- 170° beam angle · IP68
- CE and RoHS documentation · 5-year warranty
Specifications shown are for the current product versions. Always confirm the selected colour-temperature variant and current product page before procurement.
Procurement checklist for sign makers
Frequently asked questions
What is the best LED module for channel letters?
There is no universal winner. Start with the letter depth, stroke width, face material, environment and target brightness. Then test the shortlisted modules in a representative sample letter under identical conditions.
How should I compare LED module brightness?
Use lumens, beam angle, power and required module count together. The best result is the layout that produces even face illumination at the required brightness without unnecessary power or heat.
Is a five-year warranty automatically better than a three-year warranty?
Not automatically. Read the written terms, permitted operating conditions, exclusions and claim process. A responsive UK supplier and dependable replacement stock can be as important as the headline duration.
Should modules be compared by price per pack?
Use total installed cost instead: modules, power supply capacity, cable, labour, testing and the commercial risk of a return visit. A cheaper pack can cost more if it requires a denser layout or creates service problems.
Do Glowfy K2 and K8 modules use Philips chips?
Yes. The current GL K2 PRO and GL K8 PRO specifications list Philips 2835 LED chips. Check the individual product page for the exact output, power, colour-temperature and warranty details of the selected variant.
Compare with a real sample, not a sales claim
Browse the current Glowfy LED module range or contact the Birmingham team for product and project guidance backed by 15 years of signage experience.