"Airfield Ground Lighting never leaves the ground — yet nothing it does has meaning until an aircraft is in the air."
Hi everyone. I am Rahul Sharma, and for the last several years, my work has centred on a system most people never think about — Airfield Ground Lighting, or AGL.
Ask someone what makes an airport work, and they will talk about the runway, the aircraft, the terminal, the control tower. Almost no one mentions the lights. And yet, on a foggy morning or a moonless night, those lights are the only language the runway speaks to the pilot.
Picture a pilot on final approach with little visual reference beyond the cockpit glass — no horizon, no skyline, sometimes barely a shape below. In that moment, runway and taxiway lights stop being lights. They become a visual guidance system — a sequence of colour, spacing and intensity that tells the pilot exactly where the runway begins, where it ends, and how to move safely once wheels are down. Aviation safety, at that instant, is written in lighting.
"Aviation safety, at that instant, is written in lighting."
My work lives inside that system — runway lights, taxiway lights, isolating transformers, cabling, connectors, signage, control systems, and photometry — the discipline of measuring whether a light is actually doing its job, not just appearing to.
And photometry is where AGL becomes genuinely fascinating. A light can look perfectly bright to the human eye and still fail the standard it must meet. Intensity, beam spread, colour, uniformity — every one of these has a tolerance, and every tolerance exists because someone, somewhere, is trusting that light during an approach.
That trust is why we hold every installation against ICAO, FAA, and applicable Indian Standards. To me, these documents are not paperwork to be filed — they are safety requirements translated into voltage, current, beam angle and candela, engineered into the ground so that pilots never have to think twice about what they're seeing.
Because the margin for error is thin. A cracked lens, a degraded cable, a transformer running out of tolerance, one circuit reading slightly off-spec — none of it looks dramatic on the ground. In the air, on a low-visibility approach, it can be the difference between a clear guidance picture and a dangerous guess. That is why, in this field, no component is considered small.
"Knowledge shared is safety multiplied."
This is also why I built the AGL Knowledge Hub — because this knowledge should not live only with a handful of specialists. Every engineer who understands photometry a little better, every student who can read a circuit diagram a little sooner, every airport professional who can spot a non-compliant fixture before it becomes a report — makes the entire system safer.
So yes — Airfield Ground Lighting never leaves the ground. But its purpose was never about the ground. It exists for the seconds when an aircraft is in the air, in the dark, trusting what it sees below. That is the standard I hold myself to, and it comes down to three commitments:
