Which Switch Insert Fits Your FJ Strobe and Bowens Modifier?

By Westcott | Published: 2026-10-31

Category: How-to Guides

Use the Bowens-mount Switch Insert to pair FJ800, FJ400 II, FJ400, FJ400-SE, or FJ250 strobes with Rapid Box Switch and Beauty Dish Switch modifiers. Here's how to install and swap it correctly.

Quick answer

Use the Switch Insert for FJ800, FJ400, FJ400 II, FJ400-SE, and FJ250 (Bowens) to mount any Rapid Box Switch or Beauty Dish Switch modifier on those strobes. It is the only insert in this family that matches the Bowens mount used by the FJ series.

Why the insert matters more than the modifier

Rapid Box Switch and Beauty Dish Switch modifiers use a quick-change system: the modifier stays the same, and a strobe-specific insert locks into its rear opening. If you own more than one light brand, you buy one insert per mount rather than a second modifier.

The FJ800, FJ400 II, FJ400, FJ400-SE, and FJ250 all share the Bowens mount, so a single Bowens insert covers the whole family. That is convenient, but it also means the insert is easy to lose or mix up if you keep several mounts in the same case. Label or bag inserts by mount type.

When this insert is not the right choice

This insert is made for the listed FJ strobes and Bowens-mount modifiers. It is not a universal adapter for other strobe brands, and it does not convert a non-Bowens light to Bowens. If your light has a different mount, you need the insert made for that mount instead.

The catalog does not list a separate locking pin, spacer, or tool, so do not assume extra hardware is included. Work with what is in the box and the modifier's own locking mechanism.

How to install and swap the insert step by step

Power down and remove the modifier: Turn off the strobe and let the modeling lamp cool. Detach any modifier currently on the light before handling the insert. Never swap inserts with the light powered or hot; a hot lamp can burn your hands and a live strobe can fire unexpectedly.
Match the insert to the strobe mount: Confirm your strobe is an FJ800, FJ400 II, FJ400, FJ400-SE, or FJ250 and that the modifier is a Rapid Box Switch or Beauty Dish Switch. The Bowens insert is the correct match for all of these FJ models. If you also own non-Bowens lights, keep each insert in a labeled pouch so you do not grab the wrong one during a shoot.
Seat the insert into the modifier: Align the insert with the rear opening of the Rapid Box Switch or Beauty Dish Switch and press it in until it sits flush. The insert is designed to attach quickly and securely to the modifier. A flush fit is your checkpoint; if the insert rocks or leaves a gap, it is not fully seated.
Lock the modifier onto the strobe: With the insert in place, mount the modifier on the strobe and engage the light's own locking mechanism. Gently tug the modifier to confirm it is held. Do not force the mount; if it will not lock, remove it and check that the insert is seated straight.
Test before the shoot: Power the strobe on and fire a test flash with the modifier attached. Check that the modifier stays put and that light output is not blocked by a misaligned insert. A quick test fire catches a loose insert before it becomes a dropped modifier on set.
Swap inserts only when the modifier is off the light: To change mounts, remove the modifier from the strobe first, then release the insert from the modifier. Store the insert with its mount label. Swapping the insert while the modifier is still on the light stresses the locking parts and raises the risk of dropping the modifier.

Product facts

Switch Insert for FJ800, FJ400, FJ400 II, FJ400-SE, FJ250 (Bowens): All-metal construction and a 1-year limited warranty. Metal resists wear during repeated modifier changes, and the warranty covers defects in normal use.
Switch Insert for FJ800, FJ400, FJ400 II, FJ400-SE, FJ250 (Bowens)