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Hobbyist Pro Last updated: April 2, 2023

24 U `King B242X 30W LED Moving Head Gobo 9CH [087]

The U `King 30W LED Moving Head Gobo 9CH fixtures, Standard Fixture ID 087, are available from uking (SKU: B242).  The capabilities include gobos in addition to the moving head with a color wheel.


Figure 1 – U `King 30W LED Moving Head Gobo Spotlight


The fixtures have 9 and 11 channel DMX personalities.


Table 1 – DMX personality choices

DMX personality (“DMX Channel Mode”) Supported in Finale 3D



To design a show for U `King 30W LED Moving Head Gobo Spotlight fixtures, please follow the steps in DMX basic instructions and Light fixtures basic instructions.  If you don’t already have a compatible firing system or controller capable exporting a DMX script, please refer to Supported firing systems and controllers (DMX) for the list of available hardware options.


Choosing the DMX channel ranges for fixtures

Each fixture requires multiple channels, so if you are putting multiple fixtures in the same DMX Universe, you need to set the Start Address on the fixture in the real world and the corresponding DMX Channel Base on the fixture in Finale 3D to a range of channels that doesn’t overlap with others.  A DMX universe has channels 1-512.  If you want to pack as many fixtures into the 512 channels of a DMX universe as you can, back-to-back ranges are the most efficient.  Table 2 shows an example for 11-channel fixtures.  Some DMX firing systems and controllers only support 50 or 100 channels, so you may not have all 512 channels to work with.


Table 2 – Example channel ranges for 9-channel fixtures in a DMX universe

Fixture DMX Channel Base Channels Used
1 1 1-9
2 10 10-18
3 19 19-27
4 28 28-36
5 37 37-45
6 46 46-54
56 496 496-504


Technical details

The following tables show the technical specifications of the fixtures, as tested by the Finale support team.


Table 3 – DMX channels for 9CH personality

DMX Channel Meaning
Channel 1 (DMX Channel Base + 0) Pan
Channel 2 (DMX Channel Base + 1) Tilt
Channel 3 (DMX Channel Base + 2) Color (see table below)
Channel 4 (DMX Channel Base + 3) Gobo (see table below)
Channel 5 (DMX Channel Base + 4) Strobe
Channel 6 (DMX Channel Base + 5) Dimmer
Channel 7 (DMX Channel Base + 6) Motor speed (0 = max; 255 = min)
Channel 8 (DMX Channel Base + 7) Model
Channel 9 (DMX Channel Base + 8) Dim Modes


Moving head effects are implemented by setting the motor speed based on the “from” and “to” trajectory angles and the span of time between the “from” and “to” effects.  The speed channel value is calculated from the inverse of the degrees-per-second-for-speed-channel-value function.  Figure 2 shows the measured degrees per second for various speed channel values between 0 and 255, and the curve chosen to fit those values.


Figure 2 – Motor speed

The speed values near the right edge of the chart, nearing the maximum value of 255, are so slow they don’t typically arise in scripted shows, so the discrepancy between the yellow and gray lines on the far right is not that important.  A typical angle sweep of 90 degrees in a scripted show might take 0.25 seconds to 2 seconds, which equates to 360 degrees/sec to 45 degrees/sec.  Looking at the chart, the DMX Speed values from 0 to about 220 cover that range to the best of the fixture’s ability (the maximum speed of this fixture is about 320 degrees/sec according to where the gray line intersects the Y-axis).

To the extent the yellow line is an approximation of the measured performance, it is generally preferable to have the yellow line be below the gray line in the chart so the calculated speed values in the exported script become underestimates, causing the moving head to arrive at its destination slightly ahead of schedule instead of stopping before reaching the destination.


Table 4 – Shutter values for strobe as measured

DMX Value Shutter/Strobe
0-7 Open, beam visible
8-15 Closed, beam not visible
16-127 Slow to fast


Table 5 – Color wheel values

DMX Value Color
0-7 White
8-14 Red
15-21 Green
22-28 Blue
29-35 Yellow
36-42 Orange
43-49 Teal
50-56 Pink


Table 6 – Gobo patterns

DMX Value Finale 3D Identifier Image
0-7 NoGobo
8-15 ThreePartRing
16-23 WideBubbleStar
24-31 Dandelion3
32-39 Shale
40-47 Bubbles
48-55 WaterWheel
56-63 Mica
64-127 Shaking gobo options
128-255 Other options


Programmer notes

The color and gobo mechanisms of these fixtures require careful programming of the DMX Patches.    Programmers who are implementing effect libraries for U `King 30W LED Moving Head Gobo Spotlight fixtures may benefit from these notes:

  • DMX Patches for one-shot “Flash” effects set the color in setup phase because the color wheel needs to move to the correct rotation in advance of the effect to be prepared.  Otherwise the audience sees the color wheel spinning to the correct color at the beginning of the effect.  The setup phase in the U `King 30W LED Moving Head Gobo Spotlight DMX Patches is a luxurious one second by default, but since it compresses against any previous effect rather than overwriting the previous effect, the luxury has no consequence.
  • Since the fixture requires an initialize fixture effect, its fixtureDef needs to identify it for the error checking and user facing warning messages.


Table 7 – Example files and downloads

Download link Explanation
Moving Head DMX.pdf U `King 30W LED Moving Head Gobo Spotlight User Manual