Today (2011/10/11) I briefly visited the Energy Solutions Expo at London's Olympia at the very end of the day.
There was what I took to be an alarming number of snake-oil salemen present, with big stands and scandalous pseudo-science marketing claims, but lots of good stuff too.
One theme that caught my eye was lots of LED lighting vendors, many claiming lamp efficiencies of over 100lm/W, though some of those qualified with claims of "effective lumens" or "absolute photometry" rather than the "relative" stuff that HID lights quote! It's clear, marketing maths notwithstanding, that LED efficiencies are passing those of many other lamp types for domestic and commercial uses, and size/power is no longer much of an issue for most deployments.
Brightlife and istoriaLED both claimed >100lm/W with a little wobble on the definition that I have to think about, but I did like the products that both were showing, particularly the Brightlife Quad2 ceiling lighting panels (CREE LEDs within) and the MR16 16V LED lights from IstoriaLED.
Istoria generously gave me a couple of review samples (one warm/2700K+, one cool/6000K+) which I hope to report on in the next week or so. Both have an A+ energy rating, are 4.5W and 351lm (650 eff lm) and 50000h life. Initial subjective testing suggests that the cool light is nearly as bright as my 720lm/7W V5.
Dialight big HID replacements (SafeDite and DuroSite High Bay) at 150W (93lm/W) claiming to be replacements for 250--400W HIDs, and theirs were not the only massive LED lamps in the thousands of lumen range, eg the recessed modular LED light panel (ecoLED) shown by Topline Components. Considering the weak glow of the first red LEDs I got my hands on as an electronics hobbyist many many years ago, these were amazing to behold.
But sometimes you need to keep light and heat out, and the SolarGard window films caught my eye. Apparently even their premium £60/m^2 film can in the appropriate places pay itself back withing 6 years (and typical film is half that cost), but critical to project succcess is modelling and measuring to find where it would be cost-effective.
(On the subject of keeping excess heat and light out, see Sage Electrochromic Glass Is A Thermostat For The Sun from TreeHugger!)
I also got to see a few of the mythical "smart meters" of various flavours; I was told that a typical commercial single-phase unit might cost £100 in quantity.