How to make caustics in the bottom of the surface?

Hi, I have a problem. I couldn’t make the caustics reflect in the bottom of a surface, follow all the steps of the D5 video tutorial on youtube but I can’t get the same result.

How can i fix this?

Hi mate, I see you have fixed it by placing more lights, can you share your tips with other users? Thank you for that. I also put the link to the caustics tutorials here.

How to Create Realistic Caustics in Rendering | Glassware, Be Water Lamp, Swimming Pool - YouTube

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