Using a 1200W HID bulb, the VL4000 pattern computer light (title map), which produces a variety of colors, beams and strobe effects, is the flagship model in Philips' existing products. VL is almost one of the most well-known brands, but the computer lamp market is a highly competitive field. How does the VL4000 prove itself? As always, I test every step from electrical input to optical output, and then you can judge it yourself. 
The following data is derived from a sample luminaire supplied by Philips that is powered by 230V 60Hz.
Light bulb and light source
(Figure 2 and Figure 3: bulb and bulb bin)
The Philips VL4000 incorporates the now popular Philips MSR Gold 1200 Quick Bulb. This bulb has a nominal output of 95,000 lm at 1200 W rated power (see Figure 2). Interestingly, VL offers two modes of operation, standard and power-saving modes, which operate in standard mode to produce more bright output at a higher 1400w. You might think that you have exceeded the limits of the light bulb, but that's okay. If the incandescent lamp is lit at 17% higher than the rated power, then the lamp life will be greatly shortened, however, the HID bulb is completely unnecessary. As long as your bulb is within the normal operating temperature range, there is more room for maneuver to improve the impact of the power increase, so the first temperature of the VL is the precise temperature control technology. And the metaphor.
(People who have used Philips quick-release bulbs know how to change the light bulb is a good experience, I will not translate much here.)
The bulb is mounted separately in a bellows with a heat mirror, where a large fan is used to cool down. Figure 3 shows the fan and main light box vents. This seemingly unusual fan is just right here, they are both effective in reducing the temperature inside the lamp and very quiet.
Overall, the VL4000 has three modules: dimming and color control, beam adjustment, and lens system. We will look at each one.
Dimming and strobe
Behind the heat mirror is the dimming and strobe system. The dimming component is made of the embossed glass you have seen, but only the glass with uniform texture and high transparency can do the job, which determines that the spot is not round enough, the beam is not far enough, and the dimming process is enough. Not smooth enough. The VL4000's dimming curve (see Figure 4) is very similar to the VL880, which may be the consistent heritage of the VL series.
The design of the stroboscopic blade is very simple, with a notched flat knife traversing the entire beam. In strobe mode, the VL4000 provides adjustable speed from 0.5Hz to 10.6Hz (ie, every 2 seconds to 10.6 times per second).
(Figure 4: VL4000 dimming curve)
The VL4000 offers both a color wheel and a color mixing system. In front of it is a color mixing film. The four lenses of cyan, magenta, yellow and CTO are divided into two groups driven by different linear gears, or because of the help of high-permeability glass, we can get better results. However, the performance of the yellow filter is not satisfactory. The VL4000 chose a deep yellow color, so when we want to make a clear spring, these colors will be a little green (see Figure 5). The other two two-color mixed colors of lavender (magenta + cyan) and amber (magenta + yellow) are much cleaner. It seems that most people will use the fixed color wheel to take precedence over the color mixing system.
(Figure 5: color mixing effect)
The CTO sheet can smoothly reduce the color temperature from the untreated 6140K to 2822K.
Next, after the mixing system are two fixed color wheels (see Figure 6). Each color wheel has five trapezoidal color chip mounting slots and a white light slot. As you can see in the photo, the color patches seem to be interchangeable, but in order to fix them they also used silicone glue on both feet, so I did not try to remove them. The aluminum strips between the color sheets are very narrow and well-made, and no gaps are visible in the middle of the halftone effect.
(Figure 6: Color wheel)
The two color wheels are saturated colors (such as red, amber, and blue), and the other is a color that is difficult to mix (such as bright green, which is what the brain fills up).
Effect wheel
The VL4000 pattern computer light provides two independently replaceable effect wheels that enter the beam from different directions, one entering from the left and the other from the right. Once in place, they can be rotated and the position of the center of rotation can be offset by 90°. The center of rotation of the first effect wheel can be anywhere from the top to the right of the beam, while the second wheel is from the bottom to the right. It becomes concentric when they are all on the right side, which provides more results. Figure 7 shows this way in which the effect wheel (one black and white pattern, another multicolored color) is superimposed.
(Figure 7: Pattern wheel and effect wheel style)
Pattern wheel
The VL4000 pattern computer light has two rotating pattern wheels, each with 7 glass pattern pieces plus a vacancy. Figure 8 shows the positional relationship between the first pattern wheel and the effect wheel. Just like the industry routine, the pattern pieces are detachable, and Figure 9 is just the one that was taken down. The VL 4000 offers a new feature called “pattern alignment mark†so that you can easily restore it to the state it was in before it was removed. Even if this feature is not commonly used, it still comes in handy when you need it. Figure 10 is the alignment mark.
(Figure 8: Positional relationship between the effect wheel and the pattern wheel)
(Figure 9: removed pattern piece)
(Figure 10: Pattern alignment mark)
Pattern sheet replacement speed: the fastest 0.3 seconds, the slowest 0.9 seconds, the pattern sheet rotation speed: the fastest 3.7 seconds per week (16 laps per minute), the slowest 616 seconds per week (0.1 laps per minute), pattern wheel Rotation speed: the fastest 1.4 seconds per week (43 laps per minute) and the slowest 1440 seconds per week (0.04 laps per minute).
Figure 11 is the sharpest degree that can be achieved after the VL4000 loads the pattern sheet, and Figure 12 shows the change in sharpness between the two pattern sheets and the other pattern sheet.
(Figure 11: The pattern can achieve the clearest degree)
(Fig. 12: Degree of clarity of each of the pattern sheets 1 when switching between the pattern sheets 2)
Spot slice
Next we look at the beam adjustment module. The four spot slices are driven by two very very thin motors (see Figure 13). Each block can be swung 20° on both sides, can be pushed almost to the center of the spot, and can be placed around the spot at 50° on both sides. Within the rotation, it takes only 0.5 seconds to complete all of these actions.
(Figure 13: Spot slice and its motor)
The clarity of the slice is no problem, but like the other lamps, there is a common problem, that is, before the slice and pattern wheel, the sharpness of the focus is always a trade-off. In the case where the light beam is relatively narrow, the sharpness of the pattern and the slice on the pattern wheel 2 can be better exhibited, and slight deformation occurs when the light beam is relatively wide.
aperture
The last one of this module is the aperture. When the aperture is contracted to the tightest position, the spot can be contracted to 23% of the maximum state, and the beam of 2.3° and 10.4° is output at the maximum and minimum focus values.
Atomization and prism
Let's take a look at the optical module that contains the lens, atomizer, and prism. Starting from the back (closest to the aperture), the first and third lenses are used to change the focal length, and the second and fourth are used as light outputs, which are the most complex when they are simultaneously involved in atomization and prisms.
The positions of the four lens groups are different according to the setting of the focal length. When the atomizing mirror and the prism are superimposed, the atomizing mirror is inserted between the lens groups 2 and 3, and the prism is inserted between the group 3 and the group 4. Once in place, they will simultaneously participate in the movement to be scaled. This flexibility gives a special prism effect, but it also leads to two shortcomings, of course you can also be considered a function.
First, once the prism is inserted, the zoom range is reduced. Second, because of the different order of your operation, first add the prism and then focus, or focus and then add the prism, the size of the spot will be slightly different. This thing is difficult to describe in words, you need to experience and run it out.
Lens and output
We have seen four sets of lenses. Together with the existing lenses, these form a 12-element optical system of five groups of lenses (Fig. 14). The zoom action can be completed in 1.1 seconds, and the entire distance of the full focal length takes 2.6 seconds. My sampler offers a 5x zoom range with beam angles from 9.7° to 44.5°. The luminous flux is slightly different at different focal lengths, the maximum angle is 25600 lm, and the minimum is 22500 lm. These figures have dropped by 18% in the energy saving mode. 15 and 16 are illuminance tables of the spot.
(Figure 14: Lens group)
(Figure 15: The narrowest beam angle spot illuminance meter)
(Figure 16: The widest beam angle spot illuminance meter)
Horizontal and vertical
The horizontal and vertical motion range of the VL4000 is 540° and 270°, respectively. It takes 6 seconds to run the entire 540° angle and 4 seconds to 180°. It takes 3.8 seconds to fill 270° in the vertical direction and 3.5 seconds in 180°.
noise
(The author measured some operational noises 1 meter away from the luminaire, such as changing colors, changing patterns, moving in all directions, focusing, etc. The overall noise is controlled between 52.9 dB and 54.14 dB, and only the noise is maximum at startup. , up to 59.4 decibels. The specific values ​​are not listed.) When the lighting is turned into a saving mode, the noise will drop by 9 decibels as a whole.
Power and startup response time
Under the condition of 233.5V/60Hz, the current is 7.7A and the power is less than 1800w. In the cold start and hot start through the console command, it takes nearly two minutes to complete a series of actions such as self-test, which is a bit long. However, you can use the "control" channel to perform a quick reset operation, and the result of the reset is also satisfactory. Either way, the whole process is smooth and it is done in a cut-off state, there will be no images on the stage.
installation
The weight of the whole machine is 38kg. After fixing the lamp, the lamp body is also very convenient to disassemble. Figure 17 shows the appearance of the cover of the main part. Here you can easily change the pattern piece and color. Film and so on. A wrench that locks the vertical and horizontal movements is mounted on both arms.
(Figure 17: Inside the body)
control
Today, motor motors and control boards have been packaged in different locations on the luminaire. Figure 18 is a 5-way motor with a dip switch that allows for more complex settings. The two arms require a more powerful motor to drive (see Figure 19), and the electric drive components of the bulb are inside the base (see Figure 20).
(Figure 18: Motor Board)
(Figure 19: Vertical and horizontal moving arm motors)
(Figure 20: Lamp Power Supply Unit)
The Philips VL4000 has a large full-color LCD screen and 6 buttons for easy setup and viewing of fixture information. This part is powered by the built-in battery, which means you can set up each fixture in the "offline" state. Finally, it is powered by Neutrik's PowerCON TRUE 1 interface as standard. Signals are transmitted via the standard 5-pin DMX512 interface with a USB interface for system diagnostics.
Philips said that the official version of the market will support the RDM protocol in the future, but this prototype does not support it, so it is regrettable that this test has not been done.
Ok, this is the Philips Vari-Lite VL4000 graphic computer light, a luminaire that integrates a complex system and can create complex effects for you. I don't know if my assessment can help you when you choose your device. Maybe what you need will appear in the next article. In short, the choice is in you.
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