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Reviews (11)
10 February 2007
A Childs Guide to Biosphere II
This is a small, simple book, less than 100 pages. It is aimed at children around 8-12 years of age. It gives a simple introduction to the bioshere II and a few basic concepts of ecology. It is extensively illustrated and has a good index and glossary.
23 November 2007
"Invasive Procedures" Orson Scott Card & Aaron Johnston
1 of 1 found this helpful A weak, thinly written attempt at a medical thriller. Mr. Johnston somehow has had the good fortune to get the use of Mr. Cards name. Mr. Johnston may in fact be a good screenwriter, I wouldn't know. He is not a novelist. The characters in this book are uninteresting, the plot weak, and the medical background unconvincing. I cannot recommend this book to anyone.
06 December 2017
Those Cute Little 6 LED, 18 Watt, 12-24 volt light bars.
I had some doubts about these little rascals before I first bought one. Now I have two of them, I've had a chance to look them over and try them out, and they are actually OK. They list for anywhere from $5 US to $35 US apiece, but they all seem to be the exact same unit, made in the exact same factory.
The housing is a single piece of aluminum which serves as a heat sink and radiator. This is thermally effective and good design. The housing contains six cool-white, three-watt LEDs. Some listings state that they are Cree diodes, others don't quite say. Without prying the unit apart I don't know. Mine claimed a brightness of 1,700 lumens - the brightness of a one hundred watt incandescent bulb - and I think they may actually produce this.
Listings variously describe them as being flood, spot, and flood-spot (a type of beam previously unknown to science) depending on who wrote the listing. Mine is definitely floody, and I suspect all of them are the same. If you mount one of these on the front of a vehicle you will have to be careful. They have no sharp beam cutoff on any side and so will shine in the eyes of oncoming drivers.
Electrically, they will light (dimly) at 8 volts, be bright at 12 volts, and keep right on running at 24 volts. This suggests that there is a circuit board in there to manage the incoming current. It is likely that the life expectancy of this board is the life expectancy of the unit. The diodes are probably good for 50,000 hours run time if they never overheat, the board I don't know.
All in all I feel that I did well at $10 US apiece for these units.