My personal opinion with headlights is to do a projector retrofit with HIDs. HIDs in a stock housing (Not designed for HIDs) causes a lot of glare at night for oncoming traffic due to the reflector being designed for a halogen bulb. Vehicles that have HIDs from the factory in a reflector type housing are designed differently and are more box shaped to direct the light without the glare.
I would not recommend LEDs for headlight applications. They will scatter light and you will not have enough light luminating further down the road at night. Incase you are not aware, your standard halogen bulb produces about 1,000 lumens and a 4300k HID bulb produces 3,200 lumens (The higher you go up in the kelvin scale, the less lumens and light color changes from white to blue/purple). When I switched from halogens to HIDs, it was literally like night and day.
A projector will direct the light produced by HIDs and prevent the glare for oncoming traffic. A projector has a cutoff shield inside which cuts off the light and prevents other drivers from being blinded. I have a picture below of mine to show you what I am talking about. I could see a huge improvement over just HIDs in stock housing.
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I purchased all of my HID kits and projectors/parts from
The Retrofit Source online: headlight upgrades for all applications. They are an awesome company out of Atlanta with a very well known reputation. Their customer service and warranties are phenomenal. Their prices are more than what you will find on EBay, but definitely quality over quantity.
As far as converting all of your interior lights to LEDs, that is just plug and play. I have bought LEDs from many different companies, but so far the best company, IMHO, I have come across is
High Performance LED Car Lighting, Light Bulbs, LED Headlights, Taillights, Turn Signals, and Brake Lights. I have been using their LEDs for my interior lights, turn signals, reverse lights, and license plate lights for a couple years and not one LED has burnt out. Also, V-Leds will label their bulbs with a kelvin color. Most companies I came across do not. They will label them as white, but really it will look blue. Any of their LEDs labeled 5k will be bright white, so it will make it easier to make sure all of your bulbs match.