Create the right ambience with the right lighting design.
These days it is best to use LED lighting because you don't get unnecessary heat in the summer and you don't have to worry about turning them off as much. In the winter in a heating climate it is ok to use incandescent bulbs within the insulated house envelope but you don't want the hassle of changing to and from LED bulbs for the summer.
It is best to stick with the same standard light fitting as used for incandescent lights.
I very much prefer warm yellow light so these are the LED type I buy. Warm light is a low Kelvin number.
Incandescent bulbs are 2,700 K
Cool white fluorescent tube are 4,100 K
Noon sunlight: 4,500 K to 5,400K
Types of lighting
Soft general illumination that fills a room and softens shadows. The best ambient lighting fixtures are designed to bounce light off the ideally white ceiling.
Focused source of light near a work surface, a countertop, or a book. It needs to be close to the thing you are trying to light. Personally I'm not a huge fan of relying too much on task lighting. I tend to prefer a greater amount of ambient lighting. Task lights should have a switch close to the light.
Directed illumination used to spotlight an object eg a work of art or a particular architectural feature.
A fixture chosen for its attractiveness eg a chandelier. Its main function is to look nice rather than provide much light.
Layers of light
You want layers of light. The layers come from the four lighting types listed above. Some background and some task lighting. You will also want to accent some particular features or just create interest on a blank wall.
Lighting designers advocate using several layers because they enhance the feel of the room, offer flexibility in setting mood, and generally make for better illumination for how the space is used.
Think about how you're going to use each room and whether there are any specific tasks that you'll be doing there that require special attention from a lighting perspective.
Uplights from cornices
The cornices are made from CNC Hotwire cut EPS. They conform to classical architectural dimensions. Rather than being at ceiling height they are on the wall further down to leave a gap above. Simple low cost bulb holder strings are used with LED bulbs. The bulbs are typically every 1 foot round the room. A transparent acrylic strip is used to keep the dust out. Much of the light is reflected off the ceiling but some also shines across to the opposite wall. It relies on having high ceilings so that people even when standing do not see the actual bare bulb.
Use ready made light strings. Hold each socket with a 1" conduit clamp.
If you make the string of light sockets plugin to a switched power outlet (say one per wall) then it is not subject to building code.
Use dimmable 60W LED light bulbs.
If you are building your own wooden furniture then incorporate task lighting (and the switch) into the wooden piece. Also you can make wooden pieces who's only function is to act as a table lamp on a table, although even a table lamp can have useful flat surfaces and alcoves for placing nick-knacks. Use the wood to shield the bulb so you don't see the bulb and the light just shines downwards. Use a large Decora rocker light switch (definitely not a silly knurled rotate switch). It's a good idea to include a USB+100VAC outlet in the base of table lamps for charging phones and plugging in laptops.
A nice thing about plugin task lighting that has its own switch and plugs into a regular power outlet is that it is not subject to building code.
Task lighting can be done with lots of small LED lights in a glass bowl...
Lights in alcoves
Alcoves in internal stud walls are useful and break up a blank wall. They look even nicer when they have lighting. It can be a light set into the top inside edge or a stick on LED strip.
In the cornices and other places can be placed 12V LED light strips. The 12V comes from a 12V car battery that is continuously trickle charged. It has a wall switch to turn it on and off. When it is on it will continue to provide light without interruption in the event of a power cut. Using 12V lighting is more efficient that using a power inverter. Another option is to use a 12V solar panel to charge the battery.
The same 12V LED strip used to provide emergency lighting can also be used to provide lots of colors for parties. Typically these light switches come with a remote control to change colors and/or make it pulsate.
Avoid recessed can fixtures
These are used in most American houses and they produce horrible lighting. The floor is lit too much and the ceiling is too dark. They are no good for ambient lighting as they are too harsh and focused and they are too far away to be task lighting.
Ideally you want just one switch per light circuit but you want the ability to be able to turn the switch on remotely. Hopefully these "home automation" intelligent dimmers eg Insteon will get more reliable.
Personally I rarely set the lights to anything other than full on or full off but it is nice to have them dim between those two states as it is less jarring.
Rooms that have multiple entry points should have lighting controls close to these locations. Placing them at only one entrance means you'll have to walk through the dark to reach the switch if you enter from the "wrong" location. Even if you are planning on having remotely controllable switches you should still put one light switch at each entrance to a room.
Motion activated light fixtures are inexpensive. Using them also avoids having to wire wall switch. They are a great solution for infrequently visited places in the house such as storage rooms.
Typically a motion activated light also has a light sensor so it does not operate when not necessary (eg in daylight). The motion sensor can be mounted independently of the actual lighting fixture. You could use a completely different light fixture, ie just use the sensor module. You can also gang together multiple sensor modules for a bigger detection area.
Different lighting in different rooms
Ambient lighting is provided by cornice uplights.
Task lighting is provided by plugin table lamps. The lamps have their own switches so they just plugin to regular power outlets.
Alcoves are provided in the divider wall and have LED light strips.
LED light strips can also be provided above and below windows.
Put uplights (same design as used for cornices) on the top of cabinets.
Counter task lighting
Under cabinet lights are useful in the kitchen for lighting the work surface. They are best done with a routed groove into which is stuck an LED strip.
Floor accent lighting
Put a stick on LED strip in the top part of the toe kick area under the cabinets.
Counter edge accent lighting
Put a stick on LED strip on the underside of the counter overhang. This lights the cabinet wood doors when the doors are shut and provides light into the cabinet to find stuff when the door is open.
Put a strip of lights on both sides of the mirror. This is better than a strip light above the mirror.
It is good to have a motion activated low brightness lamp in a bathroom for use in the middle of the night. It should also have a light sensor so it does not come on during the day.
In a small room such as a bedroom there is sometimes no room available other than to put a hang down light fixture in the center of the ceiling. This will meet building code requirements.
High wood ceiling look particularly dramatic when you can see a long way up from the atrium into the wood beams and cladding of the roof.
Use accent lighting on the stair tread noses that is turned on and off by a motion sensor at the top and one at the bottom. Lights on stair treads look nice and makes the stairs safer. Do it with a stick on strip of LED lights on the underside of the stair tread nose.
Occasionally visited places
It is good to provide motion sensor lights in places such as closets and storage rooms.
Party colored lighting
Make your own.
Light String Wood Box
Make a 1' cube wood box. Drill holes to allow sockets from a light string to poke through. On sides and bottom have 3 bulbs to make a total of 15. Could even use 2 strings to give 30 bulbs (6 per side). Use filament LED bulbs.
Make a horizontal cross of wood and hang lots of LEDs and lots of glass ornaments.
Search on Amazon for "Chandelier". LED clear glass tubes and clear glass globes are particularly good.
Getting clear acrylic is best as no danger if it falls...
Want warm light
Also other colors (when sited together can create white light of the desired warmth).
Want black wire
Need to be able to turn off the light flashing/moving.
Clear glass balls
Beads by the roll
Small mirror tiles
Eg 1" square glued back to back.
Could position a mirror ball in the center.
LED strip accent lighting