How to Verify GRAND 420C Beam Framing Accuracy Before Production Approval

Verify the Exact Sample Before Ordering

Before releasing a production order, evaluate a physical sample configured exactly as the final GRAND 420C units will be supplied. Confirm the lamp specification, control protocol, software version, optional features, and any requested beam-shaping functions. Approval should be based on documented test results from the actual production configuration, not on general product descriptions or category assumptions.

The GRAND 420C is positioned as a Beam/Spot/Wash hybrid moving head using a 420W OSRAM SIRIUS HRI lamp. Its listed capabilities include CMY color mixing, motorized zoom and focus, static and rotating gobos, prisms, frost, animation effects, strobe, dimming, and pan/tilt movement. However, the published specifications do not identify dedicated framing shutters or a separate framing module.

Confirm Whether Framing Capability Is Available

If the project requires precise rectangular, trapezoidal, or custom beam cuts, ask the supplier to confirm the framing method in writing before approving the sample. A sharp gobo image, focused beam, or prism effect should not be considered equivalent to mechanical framing shutters.

The sample should demonstrate the exact beam-shaping solution proposed for production. Include the written confirmation in the purchase approval file so that the delivered fixtures are matched against an agreed technical requirement.

Test Optical Performance in the Real Application

Check Zoom, Focus, and Beam Edges

Test the fixture on the same type of projection surface and at a comparable throw distance to the final installation. Run the stated 4°–32° SPOT zoom range and 3°–18° BEAM zoom range while observing edge clarity, focus consistency, beam uniformity, and unwanted light spill.

For every acceptable result, record the zoom value, focus position, color selection, gobo choice, effect setting, and control command. These notes provide a practical reference for installation, programming, and production acceptance.

Evaluate Effects That Influence Beam Appearance

Review the working performance of rotating gobos, fixed gobos, prisms, animation effects, CMY mixing, and motorized focus using the intended lighting console or control system. These functions can affect the perceived beam shape and image quality, particularly in concerts, theaters, television studios, road shows, conference venues, clubs, and bars.

Ambient light, projection distance, haze conditions, surface texture, and camera settings can all change the visible result. Testing under representative operating conditions is therefore essential before a final production decision is made.

Validate Positioning and Repeatability

Repeat the same programmed scene after multiple pan and tilt movements. The GRAND 420C lists 360° continuous or 540° pan movement and 360° continuous or 270° tilt movement, along with scan-position memory and automatic repositioning after unexpected movement.

During the inspection, verify that the fixture returns to the approved projected location each time. Check whether focus remains stable after repeated repositioning and whether the beam edge stays consistent when the unit moves back to the same pan/tilt coordinates.

Review Control and Camera Compatibility

For broadcast, film, or television applications, test flicker-free operation using the actual camera settings planned for the production. The listed control options include 29-channel USITT DMX-512, RDM, master-slave operation, and automatic operation. Art-Net and wireless control are identified as optional functions.

Document the control method used during testing, including console type, channel mode, network configuration, and any optional control features. Production units should be approved only for the control configuration that has been successfully tested.

Sample Approval Checklist

Quality and Project Support

Color Imagination states that fixtures undergo functional testing, burn-in testing, safety inspection, and final quality checks before shipment. The company lists CE certificate LCSB070523036E and ISO certificate GH004-2023Q0766. Its experience includes a nightclub project in Yunnan using 3,500 stage lights across beam, wash, effect, and pixel-lighting applications.

These capabilities may support larger entertainment-lighting projects, but sample acceptance should remain the key decision point for any application that depends on accurate beam control, stable focus, and repeatable fixture positioning.

Frequently Asked Questions

Does the GRAND 420C have dedicated framing shutters?

The supplied specifications do not mention framing shutters or an independent framing assembly. Confirm the available beam-shaping function with the supplier on the actual sample before approving production.

Which functions should be tested for framing-related accuracy?

Evaluate spot and beam zoom, motorized focus, static and rotating gobos, prisms, CMY mixing, pan/tilt movement, and position repeatability. Test these features in the same control and venue conditions expected for the final installation.

What should be included in the sample approval record?

Record the tested configuration, control method, zoom and focus settings, selected gobos or effects, movement test results, camera test conditions where relevant, and the supplier's written confirmation of any framing capability. Attach these requirements to the purchase documentation.

Conclusion

A GRAND 420C sample should be used to validate beam shape, edge definition, focus performance, zoom behavior, positioning accuracy, and repeatability before production begins. Because dedicated framing shutters are not specified, obtain written confirmation before approving the fixture for applications requiring precise beam cuts.

Color Imagination provides R&D, manufacturing, sales, technical support, OEM/ODM development, and project solutions. The stated minimum order quantity is 1, with a delivery period of 20–30 days after deposit. For technical support or detailed project solutions, contact jack@color-imagination.com.

About Us

Guangzhou Color Imagination LED Lighting Limited, operating under the Color Imagination brand, is a Guangzhou-based manufacturer serving professional stage, entertainment, broadcast, event, and architectural lighting markets. Established in 2010, the company has 130 employees and a 6000SQM factory. Its engineering capabilities include optical, mechanical, electronic, thermal, software, and lighting-control development, supporting OEM and ODM projects. The company lists CE certificates LCSB070523036E and LCSB070523041S and provides products and services to clients across multiple industries.