I disagree with 400 lumen recommendation, you need between 800 to 900 lumens with a high capacity of 1100 to 1200 lumens or so. Why? because 400 lumens is not enough to see a lot of road imperfections, plus the high lumens project further down the road. Also the higher lumen capacity generally means you get a larger battery which means longer run times; if you only get a 400 lumen light the runtime will be around an hour, but if you get a 1200 lumen light the runtime will generally around 1 hour on 1200, but it will be roughly 4 hours on 400 to around 2 hours on 800.
There are a lot of good lights on the market. My experience has been that Lezyne lights are NOT any good, their batteries only last about 3 years before they will no longer accept a charge, and this goes for both their headlights and taillights. I have nothing against Lezyne, they make fantastic pumps, but I will never buy another light from them. The other issue that bugs me about lights is that most of them do not have replaceable batteries, so the LED might be good for 30,000 hours but the battery is only good for 3,000 hours, so now you throw away a perfectly good light because of the battery. That battery issue led me to buy Niterider Lumina Boost 1200, for about $35 plus postage to them, they will replace the battery, check all the electronics, seal it up and send it back.
Then I also use an old Philips Saferide 80 light because the more lights you have the more visibility you have. That light has a 400 lumen output but it is a cutoff beam so the effective beam is around 800 lumens on high, but I run it on low because it runs off of 4 AA rechargeable bats and on high it will only run for about an hour and 45 minutes, but on low for about 4 hours.
As far as I know no one makes a taillight that the battery can be replaced, but Niterider did mention that I can send it back and for $30 they'll replace the whole light, not sure how accurate that is because it seemed strange to me.
I also bought Niterider Omega 300 taillight, which is now called a 330, this is a very bright light that is highly visible even in broad daylight, I have it mounted to seat post; then I also have their Aero Sentry 260, this one is mounted to my helmet, this thing is fantastic at night both the rear and the sides of the light light-up, but because it's a cobb LED the light gets washed out during the day. I put the Aero Sentry on alternating flash, and the 300 on steady
Lastly use reflective stuff, including wide reflective ankle bands, and a nerdy safety vest with wide reflective strips that you can buy at any home improvement store.
Optionally you can buy a few tires that have reflective sidewalls, but those are tough to find in certain sizes.