Appendix, DMX Primer, General Maintenance

5.APPENDIX

DMX Primer

There are 512 channels in a DMX connection. Channels may be assigned in any manner. A fixture capable of receiving DMX will require one or a number of sequential channels. The user must assign a starting address on the fixture that indicates the first channel reserved in the controller. There are many different types of DMX controllable fixtures and they all may vary in the total number of channels required. Choosing a start address should be planned in advance. Channels should never overlap. If they do, this will result in erratic operation of the fixtures whose starting address is set incorrectly. You can however, control multiple fixtures of the same type using the same starting address as long as the intended result is that of unison movement or operation. In other words, the fixtures will be slaved together and all respond exactly the same.

DMX fixtures are designed to receive data through a serial Daisy Chain. A Daisy Chain connection is where the DATA OUT of one fixture connects to the DATA IN of the next fixture. The order in which the fixtures are connected is not important and has no effect on how a controller communicates to each fixture. Use an order that provides for the easiest and most direct cabling. Connect fixtures using shielded two conductor twisted pair cable with three pin XLR male to female connectors. The shield connection is pin 1, while pin 2 is Data Negative (S-) and pin 3 is Data positive (S+).

General Maintenance

To maintain optimum performance and minimize wear, fixtures should be cleaned frequently. Usage and environment are contributing factors in determining frequency. As a general rule, fixtures should be cleaned at least twice a month. Dust build up reduces light output performance and can cause overheating. This can lead to reduced lamp life and increased mechanical wear. Be sure to power off fixture before conducting maintenance.

Unplug fixture from power.

Use a vacuum or air compressor and a soft brush to remove dust collected on external vents.

Clean all glass when the fixture is cold with a mild solution of glass cleaner or Isopropyl

Alcohol and a soft lint free cotton cloth or lens tissue.

Apply solution to the cloth or tissue and drag dirt and grime to the outside of the lens.

Gently polish optical surfaces until they are free of haze and lint.

The cleaning of external optical lenses and/or mirrors must be carried out periodically to optimize light output. Cleaning frequency depends on the environment in which the fixture operates. Damp, smoky or particularly dirty surroundings can cause greater accumulation of dirt on the unit’s optics. Clean with soft cloth using normal glass cleaning fluid. Clean the external optics at least every 20 days. Clean the fixture at least every 30/60 days.

Always dry the parts carefully after cleaning them.

Never spin a fan using compressed air.

5. Appendix

4/19/2010 2:01 PM

LED PAR 38-18B, LED PAR 38-18C specifications

The Chauvet LED PAR 38-18C and LED PAR 38-18B are advanced lighting solutions that cater to a wide array of applications, ranging from stage performances to architectural lighting. These energy-efficient LED fixtures are renowned for their vibrant color output, reliability, and versatility.

The PAR 38-18C model features 18 tri-color RGB LEDs, allowing for an extensive palette of color mixes. This capability ensures that designers can create vivid lighting effects that enhance any event or installation. The tri-color LED technology significantly improves color blending, eliminating the need for additional colored gels. With a high lumen output, these fixtures are perfect for illuminating larger spaces or providing accent lighting in smaller venues.

On the other hand, the LED PAR 38-18B features 18 ultra-bright blue and white LEDs, designed specifically for applications that require a cooler and more focused light output. This makes it an excellent choice for architectural accents or performances that prioritize a sharper, more piercing illumination. Both models maintain a robust construction that can withstand the rigors of touring and permanent installations alike, ensuring that they not only perform well but also last over time.

The Chauvet LED PAR 38 series utilizes advanced cooling technology to minimize heat generation, leading to extended lifespan and consistent performance over longer periods of operation. The fixtures also incorporate intelligent electronic circuitry that allows for flicker-free operation, making them suitable for video applications where high-quality imaging is essential.

For versatility, both models support several operating modes, including standalone, master/slave setups, and DMX control. This versatility allows lighting designers to create intricate lighting shows with ease, while also providing the option for simple operation in less complex scenarios.

Additionally, these fixtures are lightweight and come equipped with a variety of mounting options, making installation and repositioning quick and straightforward. Users can rely on Chauvet’s reputation for quality and performance, knowing that they are investing in products designed for the demands of modern lighting needs. The Chauvet LED PAR 38-18C and 38-18B truly embody the future of lighting technology, poised to elevate any visual experience.