amaran 100d S vs 100x S: Is Bi-Colour Worth Paying For?
Quick verdict
Choose amaran 100d S for a repeatable daylight setup when its lower delivered cost leaves more budget for the modifier and stand. Choose 100x S when you regularly need warmer or cooler white light without fitting correction gels. Both are rated at 100W output and use Bowens modifiers. The main buying decision is colour-temperature control, not a change to a higher output class. Keep the daylight model if its fixed setting already gives you the result you want.
As an Amazon Associate, Gear for Greatness earns from qualifying purchases. This guide uses manufacturer documentation, not personal testing. The cover is an original conceptual colour-matching diagram, not a product photograph.
A fixed daylight room can favour 100d S
The 100d S is fixed at 5600K. That is a sensible starting point when you control the other lamps, use a consistent background and keep the camera's white balance stable. An adjustable lamp is less valuable if it remains at the same setting for every recording. Consider where the saved money would go: an appropriate softbox, secure support and a workable layout may change the picture more than unused colour-temperature adjustment.
The 100x S earns its place in changing conditions
The 100x S adjusts from 2700K to 6500K. It can be useful for a warm interior, a deliberately cooler look or a location where the surrounding light differs from your usual room. Camera white balance cannot independently fix a mismatch between two sources in the same frame. Adjusting the lamp gives you another control, although matching Kelvin numbers does not guarantee identical spectra or remove every tint difference. Judge the actual scene and camera image.

Correction gels are an alternative, with tradeoffs
A daylight light can be warmed with a suitable correction gel, but that adds a physical setup step and reduces transmitted light. If your room rarely changes, that may be an acceptable occasional adjustment. If you move between warm and daylight scenes frequently, the 100x S's control can save repeated gel changes. Plan how the gel will be held with the chosen modifier; do not assume a loose sheet near the front of the light is a complete mounting solution.
Read output figures in context
amaran lists maximum bare-light figures of 4,060 lux at one metre for 100d S and 3,640 lux for 100x S, alongside much higher reflector figures. These are manufacturer specifications, not measurements through your softbox or our own tests. A concentrated reflector reading does not describe the coverage of a diffused key light. If exposure is the real problem, compare the intended modifier and working distance before assuming a switch between these two 100W models is the answer.
What stays similar in the working kit
Both provide a Bowens mount, onboard controls, Sidus Link control and active cooling. Their normal mains setup uses the appropriate external power supply. Supported battery operation requires additional compatible equipment; neither should be bought on the assumption that a built-in battery is included. Use the exact S-series power and accessory documentation. Check softbox clearance, stand stability and cable reach for the room rather than comparing the lamp bodies in isolation.
Value and final choice
My research-based value choice is 100d S for a controlled daylight room, provided it costs less delivered. The 100x S premium is justified when adjustable white light removes a recurring setup problem. Skip 100d S if frequent warm-light matching is central to the job. Skip the upgrade to 100x S if you expect substantially more output rather than additional colour control. Confirm the exact S model, included supply, modifier costs and local warranty before ordering; no fixed price or stock claim is assumed here.
Sources and related reading
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