For some 3 years I have used track lighting for what I call "mood lighting"- overhead and used when I am showing the layout. This consists of 38 track heads, all (originally) using 50-watt halogen GU10-C -base bulbs. These are 2700K color ("warm") lighting.
I have florescent shop lights that I use when working on the layout.
The 38 heads (using Halogen bulbs) are run through a 1000-watt fixture-mount dimmer. The calculated wattage:
38 X 50 = 1900 watts, or a draw of a calculated 1900 watts. The bulbs are operated mostly at about 50% and the dimmer got warm- so that one could touch it, but you knew there was some current being passed to heat up the dimmer. The bulbs themselves also got very hot- not a problem in my basement, but would have been a problem in a train room w/ 8-9 foot ceilings.
To try LED lighting, I ordered ten 7-watt, 5000K LED GU10 base bulbs from Amazon:
Dimmable GU10 LED Spotlight Bulbs 7W- 60W equivalent. 600 Lumens, 25K hours- and 5000K ("daylight" color. These are NOT a major band, but they have a very good rating on Amazon. I installed the first ten, and was blown away with the difference these bulbs made. So- I ordered more, and now the entire layout is done using LEDs.
The power usage is not really a concern of mine. But the LEDs now draw 38 X 7 = 266 watts, at the least a calculated 86% less. I still run them at about 50%, or even less- because they are far brighter, such that I removed one head already- and may remove more. Another advantage, as well as the (likely rest of my life) 25,000 - hour longevity.
The COLOR of the bulbs is what made the greatest difference. Yes you CAN buy 5000K "white" halogens, but they will still heat up, and a brand name (GE for example) really still cost the same.
I think the resulting change is remarkable. The greens and grays really come out and "pop". Probably the best single $100 I have spent on the layout.