Hi Sergey Z., I noticed your profile and your specialities and I would like to ask you something.
This is just an inquiry, unfornately this is the only way to contact you through freelancer.
Currently I am in fase one a project which has the goal to develop a new modular led light for high masts (8-15 meters). A competitor has already a modulair ledlight and I want to develop my own. For this light (200-1000 watts) all things needs to be developed. The most important thing that needs to be developed is the heatsink. I want an heatsink that dissipates at least 100 watts of heat. Can you design such an heatsink and can you tell me what you expect for the hours you need for designing this and what input do you need for it?
We are currently thinking about the leds we will use and how many (probably ly 40-50 pcs, so 25 cm by 12 cm). When we have that I can give you the size where you can work with.
I hope to hear from you soon.