The phrase "lightweight version" means a simplified or scaled-down version of something that is smaller, simpler, and requires less resources or processing power. Full definition
There are very lightweight versions of fully reclining strollers that are great for travel and short trips to the grocery store. (mommystroller.com)
We love this ultra lightweight version of the bomber jacket with an adjustable tie - waist. (bestproducts.com)
The minimalist, lightweight version of the scooter sees the typical lateral shells removed in light of its electric motor, which occupies much less space than the traditional gas one. (treehugger.com)