Hi Stuart
I have a couple Inovva Timing lights and they work really well for the price point. I got it years ago as it was one of the few reasonably priced ones with a dwell function.
The old one is over 10 years now and have never had an issue with it. (other than a few chunks out of the case from bumping it off rad fans and Alts) The Old one still works and I use when I have get up close and personal with moving parts to read timing marks.
Here is a link To the new one I bought Model #5568.
The new one has a cover on it to adsorb some of the impact if you happen to get too close to rotating parts.
http://www.equus.com/Product/5568/IN...ing-Light-(DIS)
The #5568 can be found on Ebay for under $100 new (where I got mine).
Matthew