The KUPO ETF-BB is a beam bender accessory for S4, used when the projected light path needs to be redirected from the fixture front. It gives designers and technicians another way to work around scenery, trim height, sightline, or hanging-position limits.
Why It Matters
Some focus problems cannot be solved by pan and tilt alone. ETF-BB keeps the redirection solution inside the S4 accessory system, making the setup cleaner than external mirrors or improvised reflection hardware.
Key Features
Beam bender redirects or offsets the projected beam path for constrained rigs
Designed for S4, keeping the solution within the fixture accessory system
Helps solve sightline, scenery, and hanging-position problems without moving the whole fixture
Purpose-built accessory is cleaner than improvised mirrors or external reflection hardware
Useful when normal focus adjustment cannot achieve the desired beam position
Applications
Use it for S4 profile positions with difficult sightlines, scenery conflicts, trim-height limits, or hanging positions where ordinary focus adjustment cannot place the beam cleanly.
Compatibility
S4
Frequently Asked Questions
Is this a normal top hat or louver?
No. ETF-BB is a beam bender, used to redirect or offset the projected beam path.
When would I need a beam bender?
Use it when trim height, scenery, or sightlines prevent the S4 fixture from aiming the beam cleanly by normal focus alone.
Is it listed for S4?
Yes. The specification lists ETF-BB as a beam bender for S4.
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