Place a button directly into your Lightspeed installation which points to BRM.
Start rentals directly from withing Lightspeed. Share customers. Complete the reservation in BRM and pay in Lightspeed.
You make the reservation in BRM, then when you complete the reservation (or rental ticket) you will be automatically returned to Lightspeed, with your rental line item added to your current sale
You can easily turn your own website into online reservations engine with real-time availability with BRM. Avoid all the pitfalls of old fashioned online systems, like creating more work for yourself.