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# format auto-updated on access: Mon 27-Nov-2017 11:29:45 +01:00 CREG Journal Contents Light Work - An Overview of Sight, Seeing, Light & Lighting How does the human eye respond to various forms of lighting? Steve Clark investigates, and suggests a bright future for the new breed of high-brightness white LEDs. Foot-Candles: Photometric Units More footnotes on optical topics by David Gibson. Fluorescent Tube Drivers A selection of references to circuits for driving fluorescent tubes collected by David Gibson. State of the Art Main Caving Lamps Peter Lugwig presents his views on the ideal main caving lamp and investigates how this may be provided by new light sources and batteries. Update: Flashgun Slave This short note gives an update on the constructional information for David Gibson's slave unit. Using LEDs as Photodiodes David Gibson shows that using an LED could reduce the cost, and increase sensitivity of his flashgun slave. The Cave Radio & Electronics Group - The First 10 Years Mike Bedford and David Gibson chart our progress over the first ten years. LF Spectrum Surveys - a Review John Rabson reviews the work carried out so far makes some preliminary proposals on suitable frequencies for designers of new cave radios. Batteries at Low Temperatures John Rabson cools some batteries. Cave Radio Notebook Deforming Loop Antennas & Racal-Decca Beacons. The Future of Amateur LF Bands The 73kHz amateur band may soon be joined by one at 136kHz. Chris Trayner reports. Web Watch The Web is becoming an indispensable source of information for the electronically-minded caver. Peter Ludwig of Austria reviews some lighting-related sites. Literature Received Review of John Taylor's paper on earth current communication by Mike Bedford. A Two-tone Generator for Aligning SSB Transmitters John Hey presents a practical design for a portable unit which is suitable for use with cave radios. Spectrum News about the LF spectrum by David Gibson. The Resistance of Ground-electrode Arrays Using N electrodes in a ground array can reduce the resistance to 1/N but certain criteria have to be met. David Gibson explains the theory. Electronics Underground in Yorkshire and Mendip Richard Rushton reports on our latest two field meetings. Earth Current: Directionality & Circular Polarisation John Hey and Rob Gill describe experiments to evaluate the benefits of 'circularly polarised' earth current transmission and to measure the relationship between field strength, distance and orientation. Letters to the Editor Feedback, debate, information & news - our readers have their say. The New CREG Journal Bar Code David Gibson.