The human eye doesn't see brightness linearly. A 50% PWM duty cycle on an LED doesn't look half as bright as 100% — it looks more like 70-80% bright. This is called the Stevens power law of perceived brightness, and it's been known in vision science since the 1950s. Despite being common knowledge, most consumer LED products ignore it and use linear PWM dimming anyway. The result: the first 30-40% of the dimming range does almost nothing visible, and the last 20% is where all the action happens.
In a levitating lamp, this is especially wasteful. The wireless power link already limits your total brightness. If you're wasting perceived brightness on the dimming curve, you're leaving performance on the table.
Our approach uses HSV (Hue, Saturation, Value) color space math instead of simple PWM percentage mapping. The Value channel — which controls perceived brightness — is mapped through a power-law gamma curve calibrated to human perceptual response. At the hardware level, this translates to a non-linear PWM table where the duty cycle steps are much smaller at the low end (where the eye is most sensitive) and larger at the high end (where the eye saturates). The result is that a 10% brightness command actually looks 10% bright, a 50% command looks 50% bright, and so on — the dimming feels natural and proportional.
The gamma correction engine runs in parallel with the dimming algorithm. As brightness changes, the color temperature of an LED can shift slightly — white LEDs tend to run cooler (bluer) at high currents and warmer (yellower) at low currents. Our gamma engine compensates for this in real time by adjusting the RGB mix ratio based on the current brightness level, maintaining consistent color temperature from 1% to 100% brightness. This is subtle, but when you've seen it done wrong (and most products get it wrong), the color shift during dimming is jarring.
The performance difference is significant. At the same electrical power input, our levitating lamps deliver 32% higher perceived brightness than an equivalent linear-PWM system. More importantly, we get over 1,000 effective dimming steps versus about 128 steps with basic PWM — meaning you can precisely dial in the exact brightness you want, without visible jumps between levels.
This is standard across all GLEAGLE products with color adjustment capability: the levitating moon lamp, floating light bulb, levitating desk lamp, and magnetic floating night light. For B2B buyers sourcing LED levitating lamps or wireless floating ambient lights, the smoothness of the dimming — not just the peak brightness — is what separates a premium product from a commodity one.