Lighting has come a long way since the first Handi Quilter longarm machines were introduced. LED light strips are a great way to add throat lighting to an older machine (or quite frankly, to any of your home sewing machines, as well).
You can purchase the HQ Light Strip Kit with or without a Power Supply. If your machine has a USB port, a power supply is not needed. Just plug directly into the machine. But, if no USB ports are available, purchase the version with a power supply. Run the cord to the back of the machine, and plug into an extension cord.