Last Updated 3 hours ago
Overview
The Dedolight DLHM4-300 is the classic compact tungsten Dedo with an integrated transformer and manual dimmer. Its built-in electronics distinguish it from the DLH4, which uses a separate supply.
Product views: Dedolight California. Select an image to enlarge.
Despite its model number, it is not a 300W lamphead. The documented maximum is 150W at 24V. Region-specific mains versions exist, and the DLHM4-300DMX is a separate DMX variant.
Key specifications
| Specification | Details |
|---|---|
| Source | Tungsten-halogen with aspheric focusing optics |
| Power reference | Up to 150W at 24V with approved lamps |
| Colour / white-light range | Tungsten; lamp and dimmer dependent |
| Native beam | 4.5–48° |
| Optical accessory family | M |
| Cooling | Passive; hot tungsten fixture |
| Control | Built-in manual dimmer; separate DMX variant exists |
| Working package | Head, fitted optics, support, appropriate power electronics and cables; battery/AC accessories depend on configuration |
Strengths and limitations
Strengths
- Self-contained mains package with manual dimming.
- Classic M-size optical accessories.
Limitations
- Dimming changes colour and the head runs hot.
- Region-specific input and integrated electronics affect used purchases.
Practical uses
| Setup | Working approach |
|---|---|
| Interview edge | Focus to the shoulder and trim spill with compatible barn doors. |
| Product detail | Choose the correct M-size imager, lens and shutter/gobo module. |
| Warm motivation | Set the dimmer for colour and level, then record its position. |
Set the head position for the direction and shadow first, then choose focus and accessories for coverage. A sharp gobo or precisely shuttered image needs imaging optics; closing barn doors around a small spot does not create the same optical result.
Output and colour
The integrated supply converts the specified mains input for the approved low-voltage lamp. Check the input label, lamp code and maximum wattage. The model suffix is not an electrical rating, and a plug adapter does not change the permitted mains voltage.
For a useful comparison, record colour setting or lamp, dimming level, optic, focus position, distance and illuminated area. Measure after diffusion or reflection when that is the working setup. Wattage, centre intensity and coverage describe different parts of the result.
Power and batteries
Match the lamp’s code, voltage and maximum wattage to the exact fixture. The DLHM4-300 contains a transformer for approved 24V lamps, while the DLH652T-DMX uses its documented mains-powered lamp/dimmer arrangement. These are different electrical systems.
Check the actual mains-input label before using a region-specific head. Keep ventilation clear, allow the lamp and housing to cool before service, and use the approved procedure for relamping. The head, cable and front accessories all contribute to the working package.
Control, cooling and camera operation
| Control path | Operating notes |
|---|---|
| Local | Manual dimming on the integrated electronics, with mechanical beam focus. |
| DMX | Included on DLH652T-DMX; DLHM4-300 requires the separate DMX variant for onboard console control. |
| Colour/camera | Electrical dimming warms tungsten. Check camera exposure and colour at the intended setting; use compatible scrims when preserving operating colour matters. |
Cooling reference for this head: Passive; hot tungsten fixture. Listen to the complete working package, including its controller or ballast, rather than checking only the head.
Modifiers, rigging and the working package
| Item | Compatibility and working notes |
|---|---|
| Accessory family | M-size; check the compatibility list for the actual head and generation. |
| Projection | Compatible DP1/DP2-family M-size imager, projection lens and desired shutter/gobo/iris assembly. |
| Beam control | Model-approved barn doors, light shield ring and wide-angle/parallel-beam attachments. |
| Soft light | Compatible speedring/softbox or a properly supported diffusion/bounce surface. |
Aspheric focusing optics are different from a conventional Fresnel. Check the actual accessory’s compatibility list, locking method and lens choice. A brand name or similar front diameter is not enough to establish fit.
Fit the intended front accessory before choosing the stand position. Check tilt clearance, balance, cable movement and independent support for any external electronics. Use the documented mounting hardware and appropriate secondary retention for the installation.
Alternatives and related fixtures
| Fixture | Reason to compare |
|---|---|
| Dedolight DLH652T-DMX | Continuous tungsten light with integrated DMX. Up to 650W; approved 300/500/650W lamps; A-size optical system. |
| Dedolight DLED7N-BI NEO | Useful output in a compact M-size package. 80W head in the current California NEO listing; M-size optical system. |
| Dedolight DLED7-BI Turbo | Higher output class than the original 40W DLED4. 90W-labelled original Turbo head; M-size optical system. |
Classic Dedolight DLH4: the original low-voltage tungsten alternative with a separate supply. Compare the full power and accessory package, rather than the bare-head price.
What people are saying
Manufacturer and distributor demonstrations
Dedolight: how to use the DLHM4-300, including focusing, fitting accessories and changing lamps. View the demonstration.
Videos
Dedolight: how to use the DLHM4-300, including focusing, fitting accessories and changing lamps.
Watch the demonstration on YouTube.
Rental and used-fixture checks
- Verify lamp code, wattage and unit input label.
- Check the lamp socket, protective optics, focus mechanism and hot housing for damage.
- Run the dimmer through its range and inspect cable insulation and accessory retention.
Confirm availability of service and replacement parts with the relevant supplier before buying older equipment. Check the actual kit contents against the shot: a missing controller, imager, lens or cable can matter more than a low head-only price.
Documentation and specifications
- Dedolight California: Dedolight DLHM4-300 product and package information
- Dedolight manuals, technical sheets and photometric documents
- Dedolight imaging systems and optical size families
- Dedolight manufacturer and dealer contacts
Product photographs: Dedolight California. Published specifications describe the referenced configuration; check the markings and instructions of the actual head, controller and fitted accessories.
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