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The VPX3101 is Black and Decker's power-pack for the VPX line. It takes the 7-volt lithium pack and produces 120V (at 8 watts) and 5V (at 2.5 watts) for your toys. I ripped the guts out of one and built a flashlight into it.
So what do you do when the temperature is in the low 30's and it's raining and snowing? ....well, you certainly don't go out and shoot nightscapes! I took this opportunity to give a try at some lightpainting in a nearby culvert for runoff water. This month's assignment for the photo club I'm in is lightpainting, so I wanted to give a try at something a bit different that my typical night images.
After my first serious attempt at spinning an orb I have much more respect for those that can do this well. I'm sure that given time and with more practice that it gets easier and they look better. Anyway, mine looks like crap.
This is a single exposure shot that I was able to capture in just under 100 seconds.
Lights used:
Blue Orb: LED Flashlight on a string that had a blue plastic water bottle cap on the end.
Red Lines: Small LED glow stick that Santa gave to one of my kids at Christmas.
Green Light: LED flashlight that has 10 different colors. Thanks to Jeff Maltzman for telling me about this very cool $18 purchase.
I captured this shot by hanging a flashlight from the ceiling with a string, setting my camera on a tripod looking up. I set the camera to BULB, turned off the lights, started the flashlight swinging, and hit the shutter.
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Wenn das Blitzgerät auslöst, wird es hell.
There will be lots of lights when the flash unit is triggered.
Decided to take apart a solar powered dynamo flashlight to see whats inside.
Basically what it has is a cheap electric motor (connected to the battery along with some diodes, then a few gears which allow the hand crank to turn the motor and thus generate power.
The solar panel is soldered onto the same traces as the battery and has no diodes
The LED's are not regulated so the brightness will drop along with the voltage (which seems to top out at around 3.5V. There is also no charging circuit so it may be possible to overcharge the battery.
The solar panel does charge the battery but after using the hand crank to bring the battery to 3.4V, aiming a bright lamp at the solar panel yielded no additional voltage even after an hour. (bit it was able to charge the battery enough to give some light after running it down (so it seems that the solar panel no matter what, is not able to fully charge the battery (it would probably need a DC to DC boost module in order to charge the battery fully).
Overall the flashlight is of a decent brightness and can run for around 15-20 minutes before needing a recharge using the hand crank. (Or if you want, you can run it non stop at a low brightness level if you have a bright light source aimed at the solar panel (perfect for if you like using a flashlight in direct sunlight :) )
Easy to disassemble. Only unscrewing the tail cap is required to replace the single rechargeable Lithium battery cell shown here - a very commonly available 18650 size. All segments are sealed with rubber o-rings to keep water out if riding in heavy rain. The rings at the base of the lamp head are heat sinks to minimize temperature built up from the very hot LED emitter.
Flashlight weight = 185 grams
Made from a piece of stainless steel from a rear rack strut, a piece of plumber's strapping, and a section of innertube. The 8-LED flashlight cost $4. Extremely sturdy.
Wow. Finally i can say varta is my partner and sponsor. Im really really glad and proud because of this..... because of this opportunity i can get better tools, photos and ideas ;) on picture you can find three models of VARTA`s flashlights;
Rechargeable Lantern LED with 150 lumens
Work Light LED 435 with 190 lumens
Indestructible 3 Watt LED Lantern 4C with 150 or 50 lumens
really really really good stuff :)