Lighting and control
GLP JDC1
Choose the actual JDC1 personality, separate pixel content from shutter effects and check why the fixture stops responding while its menus are open.
Model and purpose
- Manufacturer
- German Light Products
- Model
- GLP JDC1
- Model / document scope
- Original JDC1; manual 20240830-01 for software 178-69-19
- Light sections
- 12 RGB plate pixels and 12 white beam pixels in pixel modes
- Control / protection
- DMX and RDM; 5-pin XLR IN/THRU; IP20
- Power
- 100–240 VAC, 50/60 Hz; 1200 W at 230 V in the cited documents
A hybrid strobe/wash with a white center beam, color plates and motorized tilt. It supports grouped control or segmented programming according to the selected mode. The original unit needs a dry environment; the outdoor protection and network features of other JDC products do not transfer to it.
Choose the accent and plan its control
A white hit, a steady color plate and a segmented pattern call for different programming. Describe what should change in the scene and whether segments need independent control. Then select a documented mode for the original JDC1 and assess positions; a shutter function in another mode does not establish that function in Easy.
- For a network-based show, identify the gateway delivering DMX to the fixture and its mapping. The original JDC1 does not accept Ethernet directly; JDC2 IP is not a reference for its connections or exposure limits.
- Compare sightlines, dry conditions, ventilation and tilt clearance before choosing a position. Retain manual clearances and precautions; fitting into a drawing is not sufficient.
- Plan a simple separate plate/beam look with the operator, followed by the sequence and DMX-loss rehearsal. This is a proposed test; coordinate strobe use and audience exposure without assuming a frequency makes every use safe.
Questions to define your proposal
- Is the main effect color plates, white light or segments?
- Will the proposed position remain dry indoors?
- How does DMX arrive from the console or gateway?
- What must remain visible on screen and camera?
A solution to assess with GLMedia
We can assess JDC1 accents with the required mode and DMX route. Review dry positioning, control and a camera look before finalizing scope. If exposure is unsuitable for the original model, compare equipment documented for those conditions; a continuous effect is another camera option.
Ask about rental or purchase with an accent reference, date and venue. If exposure or required functions fall outside this model, we can assess another type of fixture and the control components and services to quote.
Features and connections
Power enters through powerCON TRUE1; control uses the physical DMX link. For a network-based rig, provide a compatible gateway and map its output to this fixture. Do not expect a direct Ethernet input on the original model.
Compressed Pro and Normal provide grouped operation, while SPix and SPix Pro add different pixel control layouts. Easy is a reduced mode introduced in software 1.78 and does not include the plate shutter functions of the larger modes.
Prepare the matching console personality, DMX cabling, a documented circuit allowance and qualified mounting. Check the actual unit’s weight, rating plate and applicable thermal limits before sizing support or electrical service.
Prepare the system
- Save the show and record fixture software, mode, address, pixel orientation and flash settings. Match the console’s profile to the exact mode; identical-looking front panels do not prove the same LED revision.
- Release the tilt lock before operation, clear the head’s movement and check the approved clamp and secondary safety attachment. For transport, the current manual calls for the head to be supported in its case/packaging with the tilt lock released.
- Use grounded, protected mains, never an external dimmer. Start with an isolated low-level test and documented no-flash settings. Before leaving a control menu, clear the movement area and warn the test crew: DMX control resumes on exit.
Questions and troubleshooting
Why does my JDC1 profile not expose the same controls in SPix, SPix Pro and Easy?
Each mode provides a different set of functions, rather than simply a different level of detail.
- Compare the mode name and footprint at both ends. SPix uses 68 channels and includes built-in FX; SPix Pro uses 62 and has a different pixel channel layout.
- Check the exact table before mapping plate and white pixels. Easy uses 11 channels with grouped RGBW plate control and no separate plate shutter; do not search for a plate strobe attribute that mode does not provide.
- Recalculate the next address and save before changing mode. Compare each required function on an isolated fixture rather than compensating for a wrong profile with cues.
Check main selection and pixels separately with a simple look. If the pattern changes only when cells are cleared, record their values/groups; we can review programming and profile without assuming another show’s instance index applies.
Why does the shutter effect look weak or leave continuous light behind?
Inspect all content driving the same section. A shutter effect and steady pixel/background content can make a different look from the one intended.
- Separate the console selections for main controls, plate pixels and white pixels according to the actual library entry. Instance numbering is profile-specific; do not assume a forum’s selection index is universal.
- On an isolated unit at low intensity, compare the intended shutter effect with other pixel/background contributions released through the console. Observe the outgoing DMX and verify the mode’s intensity, duration and rate controls.
- For plate colors, inspect Plate Color Priority: FX/flash color, Color Mix and Background Color produce different combinations. Record the original value before a reversible comparison. If a visualizer differs, test the real fixture before redesigning the show.
The fixture stops responding in its menu or stays lit after DMX loss: what should I check?
The manual disables DMX control while control menus are active. Loss behavior is configurable and must be rehearsed separately.
- Check whether a menu is open before replacing cables. Prepare for movement and strong light when leaving it; return to normal operation only with the test area clear. A flashing display indicates DMX loss.
- Record No DMX Blackout and DMX Hold. The former can black out after more than 3 seconds without valid DMX; the latter offers immediate blackout, Fade Out or Hold. Do not assume every unit has the same stored loss settings.
- Review Information > System Errors if an internal fault caused blackout. Preserve the error and investigate it with service rather than disabling Error Blackout. Rehearse signal loss and return on the isolated system without forcing a reset.
The stage is exposed outdoors: can the original JDC1 be used?
The original JDC1 needs dry conditions. We can assess a genuinely compatible position or another effect documented for the intended exposure; a family name does not transfer weather protection.
- Share position, exposure and venue restrictions, even provisionally. An improvised cover does not establish that moisture, heat and movement risks are removed.
- Compare the alternative by color, white hit, segments and control, alongside mounting and power. Quote a solution for that scope rather than an automatic visually similar substitution.
We have a network console and visiting operator: what system needs preparation?
We can assess JDC1 with a complete control route to DMX. The original fixture has no direct Ethernet input; define the gateway/output as well as the console profile.
- Request show version, mode, patch and visiting system protocol. Agree what production provides and what signal, power, mounting and operation need inclusion.
- Propose a show copy and checks for plate, beam, pixels and signal loss. If adaptation time is insufficient, assess a simpler look or another effect with prior testing.
How can JDC1 and an LED screen work together without losing the camera image?
We can prepare looks balancing screen, artists and effects. A level that reads well to the audience may record differently; use intended content and exposure rather than raising every level.
- Test a continuous look and permitted accents separately with the actual camera. Record exposure, frame rate and fixture settings to reproduce the result.
- The manual provides PWM adjustments, but no single setting guarantees band-free results with every camera. If the combination is unsuitable, assess another setting, level, position or continuous effect.
- The scope can include lighting/playback coordination, rehearsal and operation. Prioritize brand readability or the presenter, reserving intense effects for agreed moments.
Quick reference
| Mode / footprint | Maximum start address |
|---|---|
| Compressed Pro — 14 | 499 |
| Normal — 23 | 490 |
| SPix — 68 | 445 |
| SPix Pro — 62 | 451 |
| 1Pix Pro — 17 | 496 |
| Easy — 11 | 502 |
Precautions
- Keep the unit away from water and moisture. Maintain 1 m from combustible material and from illuminated surfaces, with at least 100 mm clear around fans/vents. Allow at least 20 minutes to cool before handling.
- Qualified personnel must verify support, full half-coupler clamps and secondary retention against the applicable manual. Do not use alignment, casing screws or another fixture’s mounting instructions as load evidence.
- Avoid direct viewing and coordinate strobe use and audience notices. Keep the original settings and show backup; do not sweep the Special/Control channel, which can change settings or reset the fixture.
Terms on this page
- DMX
- A data protocol controlling lighting functions; each model defines what its channels mean.
- RDM
- Management communication for querying or configuring compatible equipment over a compatible path.
- Personality
- A control mode defining the channels and functions used by a fixture.
- Shutter
- A fixture function opening or closing light output; distinct from the camera shutter.
Help configuring this equipment
- JDC1 manual — 20240830-01 (PDF) — glp.de
Start with the model instructions and match the edition to the unit you will use.
- DMX index — 20191023 (PDF) — glp.de
Compare the full personality and function order with the console profile.
- GDTF: profile author, revision and modes — gdtf-development.com
Distinguish the Manufacturer tag from user contributions. Check mode and revision; a compatible file for this equipment is not confirmed here.
Documentation and sources
- JDC1 — official product data — glp.de
- LED revision technical bulletin — 20220517 (PDF) — glp.de
- JDC1 cut sheet (PDF) — glp.de
Follow the manual revision applicable to the original JDC1 and confirm hardware, software and service ratings on the unit. For transport, follow the current manual: older editions differ on the tilt lock.
Guides to plan your system
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