Replacing Halogen down lights with LED. Costs and photos

We just have 2 halogen down lights in our house, but I would like to use them more often that we do.

Oatley electronics has some 4W units available for $9 each.

I bought a few and replaced them. They work well for lighting up the stairs. The light is more blue than the halogens but OK for here.

I tried some at a friends place with electronic transformers and they don't work. The transformers probably detect no load and shut down.

So, How much can I save?

The test voltage was 13.65v

LED Current 0.31A

Halogen Current 4.2A

At 240v with say 90% efficient transformer this equates to:

LED: 4.65W ~ 20mA @ 240V

Halogen: 63W ~ .263A @ 240V

At 30c/kWh this amounts to:

LED ~0.014 cents per hour

Halogen ~ 0.19 cents per hour

Difference is .176 cents per hour. At a cost of 9$, payback is in 5113 hours or 213 days.

This might not seem much, but the lighting energy is now 7% of what is was. I call this significant.

Before:

One of each:

After with LEDs.