Is there a prompt trick to get consistent lighting across multiple AI product images?

Unfortunately, there isn't a reliable prompt trick that will give you consistent lighting across multiple images. Even if you copy and paste the exact same lighting description—"soft directional light from the left with warm shadows"—into every prompt, general AI tools like ChatGPT or Midjourney will interpret it slightly differently each time. One image might have the light coming from a 45-degree angle, the next might be more like 30 degrees, and the shadows will vary in intensity and softness.

The problem is that these tools treat each prompt as a fresh interpretation. They don't remember or lock in lighting parameters between generations, so words like "soft" or "directional" get reinterpreted based on whatever the model thinks fits best in that moment. You might get ten images that all technically match your description, but when you put them side by side, the lighting feels inconsistent.

This is where product photography tools like Nightjar solve the problem differently. Instead of describing lighting in words each time, you use a fixed photography style that locks in the lighting direction, shadow characteristics, and color temperature. Once you've set that style—either by choosing a pre-made one or creating your own from reference images—every new product image uses those exact same lighting parameters. The lighting stays consistent because it's not being reinterpreted, it's being applied from a fixed template.