Plastic?? Sorry, don't mean to be facetious but lavender is just not a great plant for indoors. It is extremely hard to adjust indoor conditions to what the plant would experience in a more normal outdoor planting situation.......plants that are typically grown outdoors in temperate climates seldom make suitable houseplants, even temporarily - too dry, too warm and inadequate lighting.

So there is no "best" variety - try any you like but be prepared for the plant not to thrive in these unsuitable conditions.

I've grown some outdoor "full sun" herbs and plants indoors with varying success. You want as much natural sunlight as you can get, and a lot of supplemental light.

Last winter, I used a combination of T8 fluorescent strips and "blurple" LED grow lights for everything.

My tomatoes and sweet peppers thrived and were as productive or maybe even more productive than similar plants were in my outdoor garden. The heavily red 'grow lights' seemed to stimulate blossoming and fruiting. My biggest issue was getting enough fertilizer to support the fruiting production without over-fertilizing.

My leafy herbs (basil, cilantro, parsley) and my woody perennial herbs (sage, rosemary, oregano, thyme) had problems. The basil and cilantro bloomed/bolted early and showed very little green leafy growth. The woody herbs also had stunted growth, a few blossoms, and poor performance. I killed the rosemary, and the thyme and sage took most of the summer outdoors in full sun to fully recover.

This year, for the leafy stuff, I'm switching over to heavily blue (with some white and/or red in the mix) lighting. I'm trying some "aquarium lights" or "reef lights" for aquariums. I'm also looking at more conventional "daylight" white (5000K-6500K) LED lights. I'm hoping my leafy herbs and woody herbs will do better with more blue spectrum and limited red spectrum light.

For lavender, you're growing it for the blooms, so I"m thinking that lavender might actually do a little better with the heavy red "blurple" LED lights, once you get the plants established.

You'll definitely need a good growing mix. You can search the container forum on here for some good growing mix recipes and mix your own, or if you want something you can buy off the shelf, look for "bonsai" growing mix. A second choice (not as good, but easier to find) would be "cactus/citrus" growing mix with some extra perlite mixed in. Conventional "potting mix" is usually to heavy and too water-retentive and can cause rotting issues in the roots.