Behind the Scenes: Matching Two Different Lights Under the Bridge

Behind the Scenes: Matching Two Different Lights Under the Bridge

Shooting under a bridge in Chicago, with striking yellow overhead lights and full midday sun just outside the shade, this behind-the-scenes breakdown covers a specific problem: an existing light source that only lights half a subject. The fix combines a gelled strobe, a strip box, and careful camera settings to make it look like there’s a second version of that same overhead light filling in everything the first one missed.

Finding a Shaded Location for Creative Lighting Control

Shooting in the middle of a bright day usually means fighting with harsh, uncontrollable light, but a shaded area like the underside of a bridge changes that entirely. Areas out of direct sun give far more control over lighting than a wide-open, perfectly lit space would, since a shaded scene is essentially a blank canvas that strobes and gels can shape from scratch.

The Problem: Overhead Light Only Lit Half the Subject

The bridge’s existing yellow overhead lights looked great hitting the top of the subject’s head, but they only covered half of her — her face was left almost completely dark, with nice light on top and nothing filling in below.

Adding a Strip Box to Fill in the Shadows

The second light never appears in frame, which is what lets it pass for part of the location.

1. Position a Strip Box Out of Frame

   Set up a strip box just out of the camera’s frame, positioned to shine light in from the side and slightly from behind the subject — effectively acting as a second light source the camera never actually sees directly.

This fills in the shadows the overhead light left behind and creates the impression that there’s another one of the bridge’s overhead lights positioned nearby, even though the shape and direction of light is coming from a strip box instead.

Matching Color Temperature With CTO Gels

Getting the direction right only works if the color matches too.

2. Add CTO Gels to the Strobe

   Fit the strobe powering the strip box with CTO (Color Temperature Orange) gels, matched to the warm color temperature of the bridge’s existing overhead lights.

Why CTO Gels Specifically

Without a gel, a bare strobe outputs a much cooler, more neutral color than the warm yellow light already present on the subject, which would create an obvious mismatch between the two light sources. CTO gels shift the strobe’s output toward that same warm orange, so the added light blends in as though it came from the same source as the light already lighting the top of the subject’s head.

Positioning the Strip Box to Imitate a Second Overhead Light

Where the subject stands matters as much as where the light does.

3. Pose the Subject Against the Available Light

   Position the subject against a wall or similar surface where both the existing overhead light and the gelled strip box can hit her from complementary angles, filling in what the other one misses.

The goal isn’t to recreate the exact same light twice, but to give the impression that there could be another one of these bridge lights positioned nearby — the strip box just needs to read as plausible additional light from the same source, not as an obviously separate studio strobe.

Choosing Camera Settings to Blend Ambient and Strobe

Shutter speed is the lever that decides how much of the location’s own light makes it into the frame.

4. Use a Slower Shutter Speed to Let in Ambient Light

   Shoot at a slower shutter speed, around 1/40th of a second, at f/5.6 and ISO 100, letting a good amount of the ambient light from outside the shaded area contribute to the overall exposure.

Why a Slower Shutter Speed Lets More Ambient Light In

Shutter speed controls how much continuous ambient light the sensor captures, while the strobe’s brief flash duration stays largely unaffected by that setting. Slowing the shutter down lets more of the scene’s natural ambient light register in the exposure, supplementing rather than being overwhelmed by the strobe.

Choosing White Balance for a Warm or Neutral Look

White balance here is a creative decision rather than a correction.

5. Set White Balance to Daylight

   Set the camera’s white balance to 5600 Kelvin, the standard daylight setting.

Why Daylight White Balance Instead of Tungsten

At a daylight white balance, the warm yellow overhead lights and the gelled strobe both read as warm and inviting, while the outside daylight beyond the shade looks natural rather than color-shifted. Switching to a tungsten white balance instead would neutralize that warm overhead light, making it look flat and gray, while pushing the outside daylight toward an unnatural blue — white balance here is really a creative choice about how warm or neutral the final image should feel, not just a technical correction.

Why This Approach Works

The entire setup depends on treating the added strobe as an extension of the existing light rather than a separate, competing source. CTO gels handle color: shifting the strobe’s neutral output to match the warm tone of the bridge’s own overhead lights means the two sources blend into one consistent color story instead of looking like two different kinds of light fighting each other in the same frame. Positioning the strip box to fill the exact area the overhead light missed, rather than lighting the whole scene evenly, is what makes it read as plausible — as if there simply happened to be a second version of the same overhead fixture nearby. Camera settings finish the blend: a slower shutter speed lets enough ambient light in that the shaded scene doesn’t look artificially lit, and a daylight white balance keeps both the warm added light and the cooler daylight beyond the bridge looking like they belong in the same photograph.

Final Thoughts

Shaded, awkwardly-lit locations like the underside of a bridge are often more useful for creative lighting than a perfectly sunlit spot, precisely because there’s an existing light quality worth building on rather than fighting against. Matching a strobe’s color temperature to whatever’s already present, positioning it to fill exactly what’s missing, and dialing in shutter speed and white balance to control how much of the ambient scene comes through are the same three levers worth reaching for in any similarly mixed-lighting situation.

Quick Reference: Settings and Tips

• LocationShade under a bridge, with warm yellow overhead lights
• Fill lightStrobe in a strip box, just out of frame, from above and slightly behind
• Match the colorCTO (Color Temperature Orange) gels on the strobe
• Exposure1/40 s, f/5.6, ISO 100 to let in ambient light
• White balance5600 K daylight for warm light; tungsten for a neutral look
• PosingAt an angle to the wall, not facing straight into it