I Am Going Camping and I Need to Light an Area Without Using a Car, Fire Or Using a Generator, What

I bought Solar lights from an outdoor center, (OSH or Walmart sells them). The solar panel charges rechargeable batteries that power 3 LED spotlights during the day which provide enough light to keep a campsite lit well past midnight. Place the solar panel (about 6"x9") in sunlight for about 5 hours and you are good to go the next night.

1. How long does it take for new solar lights to work?

One good sunny day should give them sufficient charge to turn on for awhile. My mother has a set and they charge up and work pretty well after a sunny day. Make sure the batteries are installed OK and properly oriented and maybe double check the instructions for any tips you may have missed.

2. Do solar lights work in colder cloudy climates?

yes! but not as bright as it would if it was sunny all the time!

3. What are your green gift ideas?

Try google search with keywords like : 'solar panels', 'solar battery charger' , 'solar lights', 'solar ____' whatever you can think of like - garden lights. are newable energy', 'solar air conditioning' , Also give 'windpower' a try. There are allover some very successful and interesting projects that can be done. Enjoy.

4. How to Make a LED Flashlight Circuit

White LEDs have become so common nowadays that even school kids today know how to use them for making simple LED projects. LEDs are typically used for illuminating purposes, the discussed circuit is also intended for similar applications. The post talks about how to wire LEDs and battery to make a simple DIY LED flashlight. Before the advent of the efficient white LEDs, incandescent bulbs were the only option which could be used for making flashlights. Though not as bright as a white LEDs, filament bulb type flashlights served the purpose quite well, until LEDs were invented, which completely transformed the scenario. White LEDs are so efficient that they produce 4 times more light than a conventional incandescent type flashlight yet consume 60% less power. No surprise why white LEDs are being considered as the future option for all lighting applications. The LED flashlight circuit explained here is very simple, and it simply requires to follow the instructions as given for making it successfully. The proposed circuit utilizes just a single high bright white LED, three 1.5 volt button cells and a switch. As we all know, a white LED typically needs a 3.5 volt supply for illuminating directly, without the need of any current limiting resistors. Therefore here we connect the three 1.5 volt button cell connections directly across the LED terminal for switching it ON and for getting the intended illumination from it. Being low in current the 4.5 V output from the cells does not produce any damaging effect, rather automatically adjusts to illuminate the LED very brightly. Now add a switch anywhere in between the above cell and LED connection, it becomes switchable manually, your simple LED flashlight circuit is ready. The discussed flashlight arrangement will require a proper casing for holding all the parts in place securely so that it can be comfortably operated by hand. A sample design is shown below, which may be copied for making the enclosure for the above circuit. Due to the fact the full illumination of a flashlight is not always required, an appropriate dimmer might be a pleasant power saver. The device was created around an astable multivibrator whose duty-cycle could be adjusted through potentiometer P1. The diode is included to enhance the rise time. The diode can be a 1N4148. Through T3 the AMV switches transistor T4, which in turn switches the LED lamp. T4 can work without any heatsink. The control range is such that the lamp could be tweaked to consume at about one third of its total brightness level; which means the batteries will likely then continue to operate 3 times more than its normal life. The implementation of the circuit is naturally not restricted to flashlights alone; it could likewise be employed for solar lights, radio dial brightness, etc. If an LDR is used in place of P1, it might be possible to achieve an automated dimmer that self adjusts the illumination of the lamp depending on the background light conditions.

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