1 bulb

The MACTW1 is the first luminaire to use such a bulb with the new Philips FastFit incandescent bulb (1200W, 115V, see). The color temperature of the bulb is 3200K and the rated life is 300 hours (full voltage operation). When the TW1 is operated at 117V, the dimming module has reached full output at 111V. As with all incandescent bubbles, as long as the voltage is reduced, the lamp life can be greatly extended. Therefore, this improvement can effectively extend the life of the bulb to 158%, which is about 500 hours. The author believes that this should be the result of careful trade-offs between producers: by sacrificing 11% of the light output and 50K of color temperature, the lamp life can be greatly extended. When using an external dimming silicon box, the user must also keep this in mind to avoid full voltage operation.

FastFit incandescent bulbs use a rotary locking head for quick and easy replacement while ensuring accurate filament positioning. Simply unscrew one of the screws on the panel to open the back cover and observe the white ceramic base of the bulb (see ). Rotate the base counterclockwise 45° to remove the bulb. When installing a new lamp, the pins of the base must be aligned with the two small slots and rotated 45° clockwise. The two pins of the lamp base are not the same size for the user to distinguish, and there is no error during installation.

The TW1 features a large ellipsoid glass cold reflector with an insulating glass on the front that reflects most of the heat back to the rear of the fixture. The lamp chamber is actually a completely enclosed space, which is mainly cooled by the duct airflow sent by the lamp cap fan, and the large heat sink near the reflector cup can further reduce the heat of the lamp chamber.

2 dimmers and strobes

Close to the front of the heat-insulating glass is a monolithic mechanical dimmer/frequency flash gate. Because it is far away from the light gathering plane, it can perform a very smooth and simple full-range dimming, which is basically not in the dimming process. Produces significant flicker. Before the luminaire is completely black, there will be a slight curtain effect (from left to right), but this is only a small flaw. When designing the mechanical shutter, the R&D personnel obviously worked hard, the movement of the shutter was very smooth, and the dimming curve was close to the ideal linear dimming. The stroboscopic frequency is 2 Hz to 5 Hz, which is quite good for such a large diameter incandescent dyeing lamp.

The luminaire can be used in a variety of dimming modes: mechanical dimming, built-in IGBT electronic dimming, and connection to an external dimming silicon box via a connector on the luminaire control panel. The TW1 also offers a fourth option: a built-in 80v dimming module for low-voltage bulbs. Each dimming option has its pros and cons. Compared to electronic dimming, mechanical dimming produces a faster, crisper stroboscopic and dimming effect, typically a 1200W tungsten filament takes a few seconds to completely extinguish. On the other hand, the use of electronic dimming allows the light output of TW1 to have the same dimming curve and color temperature variation as other conventional lamps that use electronic dimming. In general, both dimming methods have their own applications.

When testing the dimming curve, we found a small problem with the software. The manual states that TW1 has three dimming curves for the user to choose from: linear, square and inverse square. However, during the test, we found that the luminaire could not provide anti-square dimming. We called the company on the matter, and the relevant staff told us that the software version that was first introduced did not include this dimming option.

The term "linear" is used in moving headlights and is often ambiguous. In general, "linear" refers to the output curve of a dimmer; however, the meaning given to it by different manufacturers is also different. It may refer to linear voltage, linear power, or linear light output, depending on the object in question. For traditional silicon box manufacturers in Europe, this concept is generally referred to as "linear voltage".

Or "linear power", while the US silicon box manufacturers and all the manufacturers of moving heads refer to "linear light output." Most of the moving head lights use mechanically dimmed discharge bubbles, which are not related to voltage. Therefore, "linear" generally refers to "linear light output". The exception is TW1, which is a moving head light. Therefore, “linear” means “light output”; but the incandescent bubble it uses can also be controlled by a silicon box. Can “linear” refer to voltage?

Since the production company is a European manufacturer, the "linear" of TW1 refers to "linear voltage" rather than "linear light output."

According to the author's understanding, the linear voltage dimming curve is of no use in practical applications. Its curve is too steep and the top of the curve is difficult to control. It is recommended to use a square curve, which is very clear, is for light output, and the square curve of TW1 is close to the theoretical curve.

3 color mixing effect

Next, let's talk about three CMY dichroic color mixing wheels. The TW1 uses a standard CMY blender wheel, which is a traditional “fingerprint” style. Like the mechanical shutter, the CMY color mixing system is also far away from the gathering plane of the light. Therefore, the color mixing effect is smooth and the distribution is uniform and uniform, and no obvious color difference is observed during the change.

The TW1 uses incandescent bubbles, so the color mixing effect is slightly different from other moving head lamps that use discharge bulbs.

The TW1's color mixing system produces full-spectrum colors from light to saturated (see 4). The only drawback is that the dark blue produced by incandescent bubbles is slightly insufficient. The TW1 offers pure amber and red, as well as light blue and medium blue that are popular with theater lighting professionals. The slowest color change speed is 1 s. Table 1 shows the light transmittance when the luminaires are in different colors.

4 lenses and outputs

The optical system of the TW1 is slightly more innovative than the general dyeing lamp. The zoom system is mainly composed of three lenses.

The fixed lens on the front of the color mixing system is a larger, thicker aspheric condenser lens.

This is followed by a unique composite lens consisting of hundreds of individual microlenses that can be moved to achieve zooming. However, I believe that these microlenses also make the output beam more uniform. The compound lens has a long moving distance, so the zooming time is relatively long, and it takes about 8 seconds from the farthest end to the nearest end. The front lens is a Fresnel lens, which is also a stationary lens.

After measurement, the spot angle range is 21°~41°. When the white light is fully open, the total luminous flux of the narrow-angle beam is 7790lm, and the luminous flux of the wide-angle beam is 9295lm.

For incandescent dyeing lamps, the brightness of the TW1 is quite outstanding.

5 horizontal and vertical movement

The MACTW1 has industry-standard horizontal and vertical range of motion, 540° and 242°, respectively. In the "normal" mode, the horizontal full range movement requires 7.6s, the typical 180° movement requires 3.4s. The vertical full range movement requires 4.1s, and the 180° movement requires 3.4s.

Both horizontal and vertical positioning are accurate to 0.13°, that is to say, at a projection distance of 6 m, the movement error is about 1.27 cm. The whole movement process is very smooth, but only when the luminaire is paused, a slight rebound occurs. However, it is only detectable after the test laser is installed, and the soft-edge soft-beam is unobservable.

The mechanical transmission used for horizontal and vertical movement is similar to other lamps in the company. However, the TW1's horizontal and vertical motors have added a new relay. When the lamp power is off, the relay shorts the winding of the stepping motor. At this time, the stepping motor is equivalent to the brake to prevent the lamp body from sagging when the power is off.

6 noise

The noise level of the TW1 is quite low, most of the noise comes from the stepper motor of the zoom system, but in general, this is a very quiet fixture. The TW1 offers three modes of operation: in "normal" and "studio" modes, the motor runs at normal speed and the fan speed is automatically adjusted according to the lamp temperature; in "quiet" mode, the motor speed is slightly reduced and the fan speed is set to Minimum (Please note: The TW1 manual mentions that the fan is off in Quiet mode, which is not true. In particular, the fan's fan continues to run, but at a much slower speed). Table 2 shows the results of the noise tests, which were performed at room temperature of 75 °F (24 °C).

In the "quiet" mode, the amplitude of the strobe is slightly reduced, mainly to avoid collision between the shutter and the stop, thereby controlling the noise to around zero level. The only drawback is that the strobe rate is relatively slow.

Two additional fans are installed near the TW1 arm. When the luminaire is projected vertically downwards, the heat radiated from the lamp chamber affects the lamp arm. At this point, the fan can be turned on for cooling. At this projection angle, the heat sink may not cool properly and heat will collect at the back of the fixture. During the test, I found that these fans will turn off if set to "quiet" mode.

7 electrical parameters

See Table 3.

8 reset / initialization time

The average time from cold start to full initialization is 39s; after the lamp is powered on and the reset command is sent, the initialization takes up to 45s. Since the zoom lens moves the most slowly, the reset time depends on the position of the zoom lens. The reset function of TW1 is very good. Only after all components have been reset, the shutter will be turned back on and the dimmer will start.

9 structure

The MACTW1 is compact and compact, allowing quick access to components for easy maintenance. The optical module is fixed with two screws, and the module can be quickly removed by simply removing the front and top covers of the luminaire.

The design of the luminaire panel fully reflects the producer's attention to detail. The TW1's panel looks the same as other luminaires, which is a common metal injection molded panel. In fact, the TW1 panel is not made of plastic, but is formed by magnesium alloy. Producers should use the most advanced magnesium alloy thixotropic injection molding technology, through the accurate control of temperature and pressure, using magnesium alloy to create a similar injection molding effect. The technology is currently widely used in the manufacturing of laptops and PDAs. Magnesium alloys can be used to produce panels as thin as 0.5mm, while having high precision and strength, comparable to injection molding. The use of magnesium alloys gives designers more room to maintain the aesthetics and lightness of the injection molded panels, while achieving better strength and better heat dissipation. This technology is also used in some parts of the TW1.

The front panel and top cover of the TW1 have a good fit, and the length of the safety buckle that secures them is just enough, such as 1.27 cm longer on each side. Therefore, before hanging the luminaire, the user needs to practice how to remove and replace it.

The electronic components of the lamp head can be quickly disassembled; the two side panels are respectively fixed by four screws, and the internal components can be observed after the screws are removed.

The luminaire motor control element is mounted on one side of the base and the dimming module (standard IGBT or 80V module) on the other side. The motor and power unit are mounted between the two panels.

10 electronic circuits and controls

The TW1 has a complete menu system with a variety of options and settings. Like other MAC Series luminaires, the TW1 offers a standard 5-pin XLR plug and a traditional 3-pin XLR plug for DMX signals.

An "external bulb power" input plug and selector switch have been added to the control panel. As we mentioned earlier, in addition to the built-in dimming module, the bulb can also be powered by an external silicon box. When using an 80V bulb, care must be taken not to connect an external 115V or 230V silicon box.

This is MACTW1, a brand new incandescent dyeing lamp. Its shape is slightly larger than other similar fixtures, but it provides excellent light output and a larger zoom range. As I have said in the previous article, ellipsoidal reflectors and parabolic reflectors cannot be directly compared. Users should select the most suitable fixtures according to the application. I hope that the above information can help users make the right decision.

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