Yet another LV transformer question

I'm in the end stages of planning for a new home in the US. I'm planning on using about 70 LV Halogen downlights, and can't decide between magnetic and electronic transformers. I thought I was settled on Electronic due to greater efficiency (I plan on using the 35W IRC lamps), and I could only find one manufacturer that offers IC cans with electronic transformers. Found out the model of tranny they use:Lightech LET-60

Tranny manufacturer doesn't know the capacitance; local CBUS support says transformers over here don't have the same capcitance problems, but they are investigating.

Then, I found another line (Iris by Cooper), which provides the following details about their transformer:

"Truvolt? toroidal transformer with dual-output taps for
proper 12.0V operation. Dimmer tap compensates for
inherent voltage loss from dimmers, resulting in 30%
more lumens than traditional laminated transformers.
Toroidal design, with 90% or greater efficiency, features
a rolled one-piece continuous core of M3 grade grain oriented
silicon steel complete with an integral thermal to
protect against overheating and ensure quiet operation.
For dimming, use dimmers rated for electromagnetic
transformers.

ENERGY DATA
120V Input
Lamp Input Operating
Watts Watts Current
20 23 .19
35 41 .34
37 42 .35
42 47 .39
50 57 .48"

Questions:

1)Does this look like a good alternative to electronic transformers in terms of function and efficiency? I'm curious if this "dimmer tap" would fight the dimming curve of the CBUS Dimmer Does anyone know what this is, and how it might work?

2)I've read here that using a lower wattage lamp on a magnetic transformer results in a voltage increase that seriously decreases the life of the lamp. Such a voltage increase would increase the brightess of the lamp, would it not? Wouldn't lowering the max dim level compensate for this, and restore the lamp to its correct voltage, brightness and color (with perhaps a slight loss in efficiency)?

Thanks!

 

I thought this was because at 120v you'd have to double the current to get the same power. Only being able to have 120W per channel would make the product far less attractive!

A recessed light housing rated for direct contact with thermal insulation (Insulated Ceiling).

I saw this at the end of This Post

I was thinking of this, but I figured having a transformer in each housing would make it more practical to, in the off chance this is ever possible, replace the transformer with an LED driver and convert the (permanently installed) fixture to LED. I figured on pre-wiring for possible future DALI control of LED drivers as well. I'm sure they'll come up with a good phase-chopping solution, but it's only a bit of extra wire that would be impossible to pull later.

Sounds like this might be the solution. I was shying away from magnetic before, due to the inefficiency and potential for buzzing. Some of the other manufacturers specifically warn against using magnetic transformers in residential applications due to noise issues.