Hi Bruce,
LED lighting upgrades are easy, pretty cheap and make a huge difference in available light level, heat and power used.
I have been using waterproof LED strip lights pretty much everywhere so that only one type
of connectors is needed. There are many choices of suppliers and prices rnge from about $1/ft to $10/ft. My experience has been good so far with the cheaper strips but they have poor adhesive backing. I clean it off and use a 3/8" wide strip of double sided carpet tape. There are screw-on clips to hold them us as well.
LED strip lights come with 5050 LED chips or 3528 chips. The 5050 are bigger, put out more light, use more power and more heat. (These are very cool compared to halogen bulbs). They come in warm white (lower Kelvin temperature, more like incandescent) and cool white (higher Kelvin temp, more blue-white color). Warm white is preferred by more folks than cool white. Cool white puts out about 10-15% more lumens per ft than warm white. I don't think they use that much extra power to get the more lumens. It is something about the chips.
All of these strips can be controlled with dimmers (huge range in price on these). You can get red/green/blue strips and mke any color you want. You need different (4pin) connectors for these and special controllers. Single color strips use 2 pin connectors.
Inside I have been using Lee Valley aluminum channels, mounting clips and diffusers with the LED stips. It is a nice clean look and with the clips they are easier to install. They cost about $3/ft. Most of the interior cabinet lights are 12-18" long.
In the basement compartments iI have been using the waterproof 5050 LED strips, replacement carpet tape and the clips. I got two rolls of the cool white to compare with the warm white. Cool white seems to work well in the basement comparments where more light is good. One meter of the cool white strips uses about 12 watts and puts out about 320 lumens. I haven't finished all of the compartments yet but am planning on adding them to the engine compartment, the underside of the bed platform, the engine battery compartment, the cave (at least on my coach) where the Aquahot is located and in the generator compartment. As I get older more light is a good thing.
Most of the basement bays have switches that turn on the lights when the door is opened. They work fine. A second switch is needed if you don't want the lights on at all.
I use the double end connectors. These are good for connecting one strip to another (going around a corner) or just cut them in half for two wiring attachments. They make single ended connectors with longer wires and just about every imaginable sort of connector.
These are +/- strips. You can cut them to length about every 2 or 3 inches. + and - are marked on the strip. If you connect them incorrectly they just don't work, it doesn't seem to damage them. Reverse connections and try again.
One of the best changes we did was to replace all of the brass trimmed halogen ceiling lights with ITC LED lights (in the list below). 3" ones were a perfect fit. They come with spring clip mounts or screw mounts. We added more in the underside of the cabinet over the passengers seat and in the bottom of the kitchen cabinet where there was no ligh. We put in the 4.5" lamps over the table. Most of these are on dimmers. The small ones are around $13 at Amazon and the bigger ones about $18.
All of the flourescents have been replaced with LED strips. Put in as many as you want to get the level of light you want.
Probably way more than you asked for but I have learned by making mistakes, wiring wrong, ordering the wrong parts. Maybe this makes it easier for you. Send me an email if you need anything else.
Roger
Here is my list...
Led lighting parts
Bathroom light bulbs
Pack of TWO (2), LED 12V White Omni Bulb BA15S Clear Cover - Led Household Light
Wall lamp bulbs
Amazon.com: Pack of TWO (2), LED 3W 12V White Omni Bulb BA15D 1142 1076 Brake
Proximity switches (on/off when doors open or close)
NC NO Door Window Contact Magnetic Reed Switch Alarm 3W 10-20mm - Switch Plates
Double end connectors
Amazon.com: ZITRADES ® 2013 Waterproof Version 10pcs 2Pin LED 5050 Single
Warm white 5M 5050 LED strips
SUPERNIGHT (TM) 16.4FT 5M SMD 5050 Waterproof 300LEDs Warm White LED Flash Strip
LeeValley LED strip light channels (you don't need end caps)
http://www.leevalley.com/US/wood/page.aspx?p=71702&cat=1,43349
LED strip light Clips
ZITRADES 15pcs/lot soft Silicon Mounting Bracket clip for DC 12V 5050SMD 10mm
ITC Ceiling lights (3" & 4.5"). These are the same lights that FT is using on their new coaches. Search for ITC-RV. Lots of stuff. Amazon has lots of it.
Products
Amazon.com: ITC (69231BNSWR-3K-DB) Radiance LED Ceiling Light: Automotive
Amazon.com: ITC (69240NS-21-3K-DB) 4.5" LED Overhead Light: Automotive
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