Is this strand bright enough to light a patio?

It gives a soft ambient glow rather than task lighting. At about 0.6 W per bulb it is meant for mood and decoration, so pair it with a porch light for actual visibility.

Can I leave it outside in the rain?

It is listed for outdoor use, but the listing gives no IP rating. Keep the plug and connections sheltered or in a covered outlet, and bring the strand in during storms.

How many bulbs are on the 50 ft strand?

The strand is 50 ft with 25 plus bulbs, spaced along the run. Check the spacing against your pergola or fence before hanging.

Does it need a transformer or special outlet?

It runs on standard household power through its plug. No separate transformer or low-voltage driver is needed.

Can I connect several strands end to end?

The listing does not state an end-to-end connection rating. Treat each strand as a standalone run unless the packaging says otherwise.

What is the difference between the warm white and multicolor versions?

Warm white gives a steady amber café-light look for everyday evenings. Multicolor mixes colors for holidays and parties, but the color pattern is fixed.