That's a question so much is said about that it's impossible to summarize in an answer.
Use your favorite search engine to search for "SEO" and "SMO" or simply "generate leads". You'll find a lot of books on SEO and SMO also on amazon.com.
One of the things to consider is if you want to do this yourself or hire someone to do it for you.
Also relevant: does the amount of money for marketing in your business plan allow you to do online (say: Facebook, Google Ads, PPC on relevant sites) or off-line (say: radio, TV, magazines) advertising and to use promotions (say: a 600 lumen bulb for the price of a 400 lumen bulb, or "buy three, get one free" (note the nice rhyme).
By the way, when I went to your site in Firefox here, I got a 12.000+ lines html source, that showed exactly nothing on the screen. That certainly isn't a good way to sell your stuff.
I have created a new eCommerce website leduncle.com about led lights, led bulbs but i don't know strategy how can generate more lead online or offline. can you explain me.