Everbrite MedLux™ Support Site
Spec & Installation Info Site


Q: What is the difference between a HBT and a Ceiling GPI?
The HBT is intended to illuminate an area, much like a fluorescent troffer.
As such it creates a light level similar to a standard fluorescent troffer.
The GPI is designed to illuminate a graphical faceplate in a gentle and even manner.


Q: How do the High Brightness Troffers (HBT) work?
The HBT are powered by 48VDC from the ELT600-48U power box. and are fully on without a dimming control connected.
The dimming control can be our ECL-53-CR, or a commercial 0-10V control in conjunction our XLIM box.
These HBT fixtures cannot be dimmed by incandescent lighting dimmers or fan speed controls.
Both the 48VDC and the dimming control signal must be filtered before entering the MRI shielded room.
The ECL-53-CR dimmer may be used in the MRI shield room due to its special waveform and shielding, but the XLIM box cannot.
However, locating the ECL-53-CR it in the shield room may not be possible with some newer highly sensitive open-bore magnets.
Q: What are the wiring rules for installing HBTs?
Each ELT600-48U power supply box can power up to 10 of the 2x2, or 5 of the 2x4 troffers.
The 2x2 troffers will use one output each from the fuse box, but the 2x4 troffer requires two outputs each.
When using a signal filter to broach the MRI room wall, you must solder the wires on the equipment room input side of the filter!
Failure to do so will often result in flickering effects in the HBT troffers.
You can also get flickering in the HBT troffers if the signal filter input feedthrough capacitor has been damaged.
So be careful when you solder to the signal filter tabs.


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📌Bruce Neville - Engineering Manager
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720 West Cherry Street
Chanute, Kansas 66720
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