I had a problem last spring that I keep coming back to. I was mid-setup on a beauty editorial, two hours before talent arrived, and my lighting felt assembled rather than designed. Every modifier was doing something, but nothing was talking to anything else. The images were technically fine. They were also completely forgettable. I’d been adding gear for years without sharpening the underlying system behind how I use it.

That’s the kind of problem a good tutorial doesn’t just fix. It reframes.

In this Joel Grimes tutorial on building a strobe system, Grimes lays out not just what gear he uses, but the logic of how the pieces work together. That’s the part most gear videos skip entirely.

The Core Problem With “More Lights Is Better”

The instinct for most photographers moving into strobes is additive. Buy a key light. Then a fill. Then a rim. Then a hair light. Then a background light. Before long you’ve got five heads, twelve modifiers, and you’re spending the first hour of every shoot just making decisions that should have been made before the subject walked in.

What Grimes pushes against is that accumulation-without-architecture approach. His system is built around understanding what each light is responsible for, not just what it does technically. A fill light isn’t just a softer version of your key. It has a specific job relative to the key, and that ratio relationship is the thing you’re actually controlling when you dial power up or down.

This is a distinction I wish someone had handed me ten years ago, written on a piece of masking tape and stuck to my first monolight.

How the Ratio Logic Works in Practice

The heart of what Grimes demonstrates is the relationship between key light and fill, specifically how to set up a system where you can change the mood of an image by adjusting a single variable rather than re-balancing everything from scratch.

His approach: establish your key light first, get it where you want it, then set your fill at least one full stop below. That one-stop difference creates the shadow depth that gives an image dimension. Close the gap and the image goes flat. Push it to two stops and you’re into high-drama, high-contrast territory that reads differently on skin depending on the modifier you’ve chosen for the key.

The practical setup he works from involves a main strobe with a large modifier, something in the softbox or octobox range, positioned to the side and slightly above the subject. The fill comes from the opposite side, often with a smaller or less diffused modifier, dialed back in power. He’s not filling to eliminate shadow. He’s filling to control how deep those shadows go.

For camera settings, Grimes keeps his shutter at or below sync speed, typically around 1/160, and sets ISO low (100 is his default) to keep the ambient contribution minimal. This gives the strobes full authority over the exposure. Your aperture then becomes the tool you use to dial in depth of field without chasing the light.

Building Toward a Repeatable Starting Point

What I find most useful about his framing is the idea of a starting point rather than a final setup. He’s not saying this ratio and this modifier is the answer. He’s saying that if you build a reliable baseline, one key, one fill, specific power relationship between them, you can make intentional decisions to deviate from it rather than accidental ones.

I do something similar. I keep a lighting journal where I sketch every setup from every shoot, just pencil diagrams with power settings noted in the margin. What Grimes is describing is the kind of systematized thinking that makes that journal actually useful. When you understand why the baseline works, the deviations start to teach you something.

Where I’d Push This Further (and Where It Has Limits)

Grimes’ system works beautifully in controlled studio conditions with a predictable subject-to-background distance. Where I’ve found it needs adjustment is in location work where the ambient light has a different color temperature than your strobes, or when you’re shooting very dark or very light skin tones and the fill ratio needs a finer calibration than a single stop provides.

I’ve also found that the modifier choice on the fill changes the character of the image more than most photographers expect. A fill through a large diffused panel reads differently than fill bounced off a white wall, even at the same measured output. The hardness of the fill shadows, the ones wrapping under the chin and filling the eye socket, affects how “real” or “cinematic” the final image feels. That’s not something you can fully convey in a ratio number. It takes testing.

My standard practice now is to test every new modifier the same day it arrives. I’ll run it through a basic two-light setup and photograph the same subject at three different power ratios. It sounds tedious. It means I never walk into a shoot guessing.

The Single Thing Worth Carrying Away

The most transferable idea in Grimes’ tutorial is this: your ratio is the mood, and your modifier is the texture. Get those two variables under deliberate control and most other decisions follow from them naturally.

Watch the full video for the visual demonstration of how Grimes positions and adjusts each light in real time. Seeing the shadows shift as he changes ratios is the part that makes the numbers make sense.