ive been doing a few 1.5 metre deep by 9 metre signs. 30ft up…
each time i have opted for the greener approach and went with LED trough lights from Insight sign systems.
the entire trough light is more or less empty. no workings so they are soooo light and easy to work with. which really helps on big signs. go with superbright led troughs from insight. i think you will pay about £10 per foot for their regular trough lights and approx £14 per foot for the led option.
i find it very easy to sell these toughs to BIG companies trying to do the whole green thing, so its a feather in their cap for choosing the led route and are willing to spend the light more, but save allot long term on bulb changes, maintenance and electricity. even the smaller companies DO see the benefits, but many still penny pinch and opt for fluorescent tubes.
http://www.insightsignsystems.com/highlightmk4led.htm