As Lester says, that instrument is often referred to as a "radial", given that the lamp is not in axis wit the rest of the optics. Skipping over everything pertinent to the differences between Radial/Axial, and moving onto the portion where you referred to it as a "Parabolic".
An example of a "Parabolic" instrument would be a PAR. PAR is an acronym for "Parabolic Aluminized Reflector". Whereas the light you pictured, and any S4, Leko, ERS etc. would be classified as an "Ellipsoidal". (Note that ERS is an acronym for Ellipsoidal Reflector Spotlight.) While both are examples of conic sections, it is important to note the difference. Have you taken Algebra? All of that should be covered in depth by your class, and will be relvant to lighting.
If for no other reason than to contradict the porcine product... DCATTechie, a member posted on here a few months back that a Colortran ZoomMini, with 600W FMR, out-performed a SourceFour, with HPL575. Definitely worth looking for the lamp caps for these. I posted the photometric performance of these in that thread.
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The Axial 360Q, with a t/h lamp was introduced in the early to mid 70's, just to set the record straight.
Altman continued to make the incandescent capable 360 - so called Radial, for at least a decade later.
Steve B.
Don't doubt/shoot the messenger. See this thread.Err.... I seriously doubt it.
ST
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