The phrase "a core light" is correct and usable in written English.
It can be used in contexts discussing essential or fundamental aspects of illumination, whether literal or metaphorical.
Example: "In our design, we decided to focus on a core light that would enhance the overall ambiance of the room."
Alternatives: "an essential light" or "a fundamental light".
Personally, I wear a Suunto Core Light Black (because it warns of inclement weather, and also tells you the sunrise and sunset times), I always carry a multi-tool (like the Leatherman Skeletool), and I shove all my other stuff (like cellphone, wallet, GPS, etc). in my Evolution Travel jacket.
Another method of using a rigid air core light guide between the scintillator and the optical fibre was proposed to prevent Cerenkov light production (Law et al. 2006).
Images were taken with an EVOS XL Core Light Microscope (AMG Bothel, WA) using a 40 × objective.
Images were taken with an EVOS XL Core Light Microscope (AMG Bothel, WA) using 20 × and 40 × objectives or a Nikon Eclipse Ci camera (Melville, NY) equipped with a Nikon Digital Sight DS-U3 microscope camera controller and Nikon's advanced imaging software suite NIS-Elements.
Images were taken with an EVOS XL Core Light Microscope (AMG, Bothell, WA) using 20 × and 40 × objectives or a Nikon Eclipse Ci camera (Melville, NY) equipped with Nikon's Digital Sight DS-U3 microscope camera controller and Nikon's advanced imaging software suite NIS-Elements.
Suunto's Core Light Black is a big watch.
Further improvements could include dissipation in oceans or internal liquid layers, variable internal composition, internal structures, radiogenic heating rates, core light element depression, continental crust formation, and eventually a direct coupling of first-principles numerical simulations.
MSRP on the Suunto Core Light Black is $389, however if you shop around a bit you can probably find if for around $250.
Each monomer (Figure 4A) consists of two major domains separated by a deep active site cleft and contains six subdomains involved in the ATPase core (light green), intersubunit interactions (aquamarine) and substrate binding (red).
