JOB: short term technical help

SHORT TERM TECHNICAL HELP

MY BACKGROUND
In business for 22 years, selling wholesale to retail gift shops and big box stores. We were the first to sell framed, reverse printed glass on a large scale. We used our original art and vintage prints. I sold part of the business this summer.
PROPOSAL
Develop art work or a new product that would incorporate current technology and new thinking. To advance, I need to understand certain parameters.
SEEKING
Short term help to develop the technology to solve the following problem:
To make 2 freestanding objects recognize each other and light up when they come in range.
1. What is that range?
2. I assume LED lights and batteries so there is no need for electrical cords.
3. Size