DM IP68 vs JT Rainproof: How to Choose for an LED Signage Project
Short answer
Choose a Power Supply by the actual installation environment, not by treating Rainproof and Waterproof as interchangeable terms.
MIJI classifies the DM series as IP68 Waterproof and the JT series as Rainproof. DM should be considered when the project requires the sealed environmental protection defined for the approved DM model. JT is a more economical option for protected installations where rain exposure, mounting direction and ventilation can be controlled.
The final model must also match the LED voltage, calculated load, ambient conditions and installation method.
DM and JT serve different project conditions
| Selection factor | DM series | JT series |
|---|---|---|
| MIJI product classification | IP68 Waterproof | Rainproof |
| Public JT IP grade | Not applicable | No public IP grade approved |
| Typical selection reason | Project requires a sealed waterproof product family | Project can use a protected, ventilated Rainproof installation |
| Installation decision | Follow the approved model specification and environmental limits | Control rain direction, mounting, terminals and airflow according to approved instructions |
| Cost position | Confirm by model and quotation | Designed as a more economical project option |
| 12V/24V availability | Available within the DM range; confirm the exact model | Confirm the required JT model and approved output variant |
This table is a selection starting point, not a substitute for the model specification or project engineering review.
Start with the installation environment
Ask where the power supply will be installed and what exposure it will face:
- Is the unit inside a sign cabinet, electrical box or protected service area?
- Can rain reach the enclosure or wiring terminals directly?
- Is there a possibility of standing water or temporary immersion?
- What are the expected ambient temperature, dust and ventilation conditions?
- Can the required mounting direction and clearances be maintained?
If these conditions are not known, do not select a model only from the word “outdoor.”
Match voltage and calculated load
The power-supply output voltage must match the LED load. A 12V LED assembly requires an approved 12V supply; a 24V assembly requires an approved 24V supply.
Add the rated wattage of the connected Led Modules or strips, then apply the engineering margin approved for the project. Cable length, voltage drop, ambient temperature and enclosure ventilation may affect the final choice. Do not assume that a higher wattage alone makes a model suitable.
Consider heat without making universal comparisons
Enclosure construction affects how a power supply manages heat, but no product family is automatically cooler or longer-lasting in every installation. Load, ambient temperature, airflow, mounting, component design and enclosure conditions all matter.
For a Rainproof installation, required airflow and mounting instructions must be maintained. For a Waterproof installation, use only the environmental limits and installation instructions approved for the exact DM model.
A practical selection workflow
- Confirm the LED system voltage: 12V or 24V.
- Calculate the connected load and required engineering margin.
- Record the installation location and possible water exposure.
- Check ambient temperature, ventilation, cable length and enclosure space.
- Compare the approved DM and JT models, then confirm commercial terms in the quotation.
Information to send for model selection
- LED output voltage
- Total calculated wattage
- Installation drawing or clear photos
- Indoor, protected outdoor or exposed location
- Expected temperature, dust and water conditions
- Required quantity and destination country
MIJI can then review whether a DM Waterproof or JT Rainproof model better fits the stated conditions.
Frequently asked questions
Is a JT Rainproof power supply Waterproof?
No. JT is controlled as a Rainproof series and must not be described as Waterproof.
Does JT have an IP rating?
No JT IP grade is approved for public use. Selection must follow the Rainproof classification and approved installation limits.
Is every DM model IP68?
MIJI classifies the DM series as IP68 Waterproof. Confirm the exact model specification and approved evidence for the project.
Is Rainproof always better for heat dissipation?
No universal comparison should be made. Thermal performance depends on model design, load, ambient temperature, airflow, mounting and enclosure conditions.
Which option is better for a UAE signage project?
There is no single answer for every UAE project. Select from the actual water exposure, heat, dust, ventilation, voltage and load conditions, then confirm the exact model with MIJI.
Need help selecting a model? Send MIJI your voltage, total load, installation conditions, quantity and destination for project review.