Bought these for the looks, and LED switchbacks knowing after reading others' reviews that the stock halogen bulbs are awful. Seriously, they suck. You CAN'T SEE with the stock headlight bulbs! For the price of these headlights, LED should be standard equipment. Nuff said.The headlights themselves were actually pretty easy to install on a 2013 Chevy Tahoe. Good fit, and they look fantastic after install. While I was at it, I opted to buy replacement LED fog lights also. I would recommend new fog lights to anyone, they really make a big difference. Below you'll find links for all the bulbs I ordered and the fog lights.One of my concerns was the amount of adjustment possible up and down with the adjuster screw. I would recommend that you turn the adjuster all the way up (counter-clockwise) after you've put your headlight bulbs in, and before you mount the headlight assembly into the vehicle. Much easier to adjust them down if needed. Mine were perfect adjusted when turned all the way up. Before you install SEE MY NOTES at the end!Another concern I had was blinding other drivers and constantly being flashed with low beams on. So far so good. Out on the road the low beams have a nice cutoff line that's about hood/fender height when shining towards oncoming traffic. It's a fairly clean line and level side to side. High beams are absolutely fantastic. See the included pics: low beam with fog lights facing front, low beam, high beam, switchbacks and amber and one pic of old headlight.One gripe I have is these assemblies use outdated bulb types. H1 for High Beam and H7 for Low Beam. LED bulb selection is somewhat lacking and variety is scarce. After much trial and error, several Amazon returns and some browsing at local auto parts stores I found the winning combo.Fog lights (BICYACO) https://www.amazon.com/gp/product/B081SSRT8N/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1LED daytime running light bulb for headlight assembly (iBrightstar 3157) https://www.amazon.com/gp/product/B01MDUEBX1/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1Low Beam bulb (Lsyomne H7) https://www.amazon.com/gp/product/B08HGHBLMD/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1High Beam bulb (Lsyomne H1) https://www.amazon.com/gp/product/B08HGLD99D/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1LED backup bulbs for taillights (iBrightstar 7441) https://www.amazon.com/gp/product/B06XQWPKKX/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1** When installing my finished headlight assemblies into my 13 tahoe the clearance is TIGHT between the low beam bulbs and the radiator support but they DO fit, and dust covers are in place also. Take your time wiggling everything into place and especially when cinching down your mounting bolts. I found that by tightening the bottom bolt first and then the upper ones it less likely to jar the low beam bulb. If the low beam bulb is pressed too hard against the radiator support it will pop a "ball and socket" type connector inside the headlight. This ball and socket is part of the up/down adjuster screw mechanism. It is cheaply made and if it comes apart your headlight adjustment will end up pointing low. If this happens, DON"T panic. It's a pain in the ass but you'll end up pulling the headlight assembly completely out again. remove the dust cover on the low beam side and look inside from the rear and you'll see where the ball and socket came apart. Turn the adjuster screw all the way down (clockwise) then work them together again using a long screwdriver. Once the ball and socket are together again re-adjust your adjuster screw all the way up again. Install your headlight again being more careful this time :)I've been driving for a week so far and everything works great. The lights really brighten everything up so good at night and its so much safer driving. It really updated the look of my 2013 Tahoe.Happy Tinkering.