Achieving exceptional lighting is the key to a stunning shot—just ask any film crew’s lighting department. With IC Light, paired with the robust capabilities of ComfyUI, users can create lighting adjustments with the precision and quality of professional setups.
Unlike typical photo editors, this AI-powered technique applies lighting that realistically interacts with objects, contours, and shapes within the scene, enhancing depth and realism. In this guide, we’ll walk you through how to harness IC Light and ComfyUI for seamless, high-quality lighting effects using a prompt and workflow.
We'd like to credit CGTopTips for their knowledge of the IC Light Workflow!
How to Use IC Light in ComfyUI
One-Time Setup
Custom Node
If there are red nodes in the workflow, it means that the workflow lacks the certain required nodes. Install the custom nodes in order for the workflow to work.
- Go to ComfyUI Manager > Click Install Missing Custom Nodes
- Check the list below if there's a list of custom nodes that needs to be installed and click the install.
Models
Download the recommended models (see list below) using the ComfyUI manager and go to Install models. Refresh or restart the machine after the files have downloaded.
- Go to ComfyUI Manager > Click Install Models
- When you find the exact model that you're looking for, click install and make sure to press refresh when you are finished.
Model Path Source
Use the model path source if you prefer to install the models using model's link address and paste into ThinkDiffusion MyFiles using upload by URL.
| Model Name | Model Link Address |
|---|---|
| epicrealism_naturalSin.safetensors | |
| iclight_sd15_fc_unet_ldm.safetensors | |
| model.pth |
Guide Table for Upload
Reminder
Procedures
Now that the hard work is out of the way, let's get creative. You need to follow the steps from top to bottom. The workflow is a one-click process after everything has been set up.
| Steps | Default Nodes |
|---|---|
| Load an Image |  |
| Set the Image Size |  |
| Set the Relighting Shape and Location |  |
| Write a Prompt |  |
| Set the Models |  |
| Set the Generation Settings |  |
| Check the Output Image and Adjust your Preferred Lighting Settings |  |
x means horizontal movement
y means vertical movement
-blur sigma (default 1)
-ic light multiplier (default 0.182)
-brightness (default 1)
-contrast (default 1)
-saturation (default 1)
IC Light Examples
Detailed Ball
Prompt: orange ball, light from left window, basketball floor
Seed - 113881076738147
steps - 30, cfg - 2, denoise - 1, dpmpp_2m_sde, karras
Blur Sigma - 1.25
Light Multiplier - 0.200
Light location - x - 100 , y - 200
Brightness / Contrast / Saturation - 1.5 / 1.5 / 1
Detailed Book
Prompt: book, light from right, placed at wooden table
Seed - 209876273013979
steps - 30, cfg - 2, denoise - 1, dpmpp_2m_sde, karras
Blur Sigma - 1.25
Light Multiplier - 0.182
Light location - x - 600, y - 200
Brightness / Contrast / Saturation - 1.5 / 1 / 1
Detailed Cat
Prompt: white cat, light from left, city street background
Seed - 780951914447608
steps - 30, cfg - 2, denoise - 1, dpmpp_2m_sde, karras
Blur Sigma - 1.25
Light Multiplier - 0.182
Light location - x - 100, y - 200
Brightness / Contrast / Saturation - 1.5 / 1 / 1
Detailed Shoes
Prompt: shoes, afternoon, forest floor background
Seed - 711521066701579
steps - 30, cfg - 2, denoise - 1, dpmpp_2m_sde, karras
Blur Sigma - 1.25
Light Multiplier - 0.2
Light location - x - 600, y - 200
Brightness / Contrast / Saturation - 1.5 / 1 / 1
Any of our workflows including the above can run on a local version of SD but if you’re having issues with installation or slow hardware, you can try any of these workflows on a more powerful GPU in your browser with ThinkDiffusion.
If you are feeling inspired and want to learn about LoRA's then check out this ultimate guide to LoRA's in ComfyUI Here.
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