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 5W 300LM Aluminum Bright CREE LED Flashlight Torch 3 Mode Adjustable Focus Zoom US $6.21 
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 5W Bright LED Flashlight Torch Waterproof Camping/Sport US $.90
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 HeadLamp - 5W Led Zoomable CREE Headlight Flashlight US $.01
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 5W Newest Bright LED Waterproof Flashlight Torch Outdoor Camping Carrying Light US $.99
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 X Cree LED HEADLAMP FLASHLIGHT 5W Lamp Light Spotlight S US $.85
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 5W 220 Lumens CREE Led Flashlight Torch Lamp + Holster US $.01
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 New 5w AA LED Torch Flashlight Lamp Fishing Waterproof + Tripod P262 US $9.07
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 5W Bright LED Flashlight Torch Waterproof Outdoor Camping Sport Carrying Light US $.89
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 Black 5W LED Torch Lamp Flashlight Light Camping Hiking US $1.00
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 X 5W CREE LED HEADLAMP FLASHLIGHT Head Lamp Light Black US $.94
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 HeadLamp - 5W Led Adjustable CREE Headlight Flashlight US $11.34
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 5W 300LM Aluminum Bright CREE LED Energy Flashlight Torch 3 Mode Zoom Adjustable US $5.90
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 270 LUMEN CREE 5W LED Torch Flashlight Light LAMP #3-7 US $.99
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 5W LED Flashlight Waterproof Torch Lamp Camping US $12.59
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 300 Lumens CREE Led 5w Flashlight A7 Torch Lamp+Holster US $.99
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 NEW Mini Portable 5W Black 2 in 1 Bright 1 LED Flashlight Torch Lamp Camping US $3.30
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 5W Cree Led Headlamp Headlight + 5W Flashlight Torch US $.01
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 CREE LED 300 Lm 5W Torch Lamp K5 Fishing Flashlight US $.99
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 ZOOMABLE 5W CREE Q5 LED HEADLAMP FLASHLIGHT 18650+CH Q8 US $4.99
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 NEW Mini 5 W LED Flashlight light Torch Lamp Lantern Black for Hiking Camp Sport US $2.55
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 5W CREE Led 300 Lumens Flashlight A15 Torch Lamp 2-MODE US $6.20
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 CREE LED 270 Lm 5w Flashlight A20 Torch Lamp +Holster US $.99
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 Q5 CREE LED 300Lm 5W Zoomable Flashlight Headlamp Torch US $.99
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 5W Black 2 in 1 Bright 1 LED Flashlight Lamp Camping US $11.40
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 160 Lumens CREE Led Lamp Flashlight + 5W Zoomable Headlight HeadLamp + Free Gift US $6.81
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 ZOOMABLE ZOOM 5W CREE Q5 LED HEADLAMP FLASHLIGHT 3x AAA US $4.69
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 ! 5W CREE LED Zoom HEADLAMP FLASHLIGHT Head Lamp Light US $.85
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 CREE 5W LED 300 LM Zoomablr Headlamp Light Flashlight Torch US $.99
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5w Flashlight
Buy A Flashlight For Diving - How To Select The Right One
When considering underwater lighting some divers may believe that brighter is always better. Therefore, when they buy a flashlight for diving, they go with the highest intensity beam. While this may work in some situations such as cave diving, a brighter light is does not always work best when the water is murky and filled with small debris. In fact, when the water is filled with particulates, the brighter flashlight can decrease visibility.
However, not only does a diver carry their primary light for underwater diving but safety demands they also carry at least one and preferably two more lights, just in case the primary light fails. These lights should ideally be of different strengths so that when the situation demands they can serve as alternate lights to suit the water and in case of the primary light source fails.
Rechargeable batteries are a boon to divers, particularly those who might go on extended dive vacations. Rechargeable batteries can eliminate the necessity of packing along extras for replacements or possibly running short in the middle of a trip. The battery should have a life of at least three times the expected length of the dive in order to provide a wide margin of safety and avoid having to call the dive off due to battery failure.
Flashlights used for scuba diving have various depth ratings just as any other piece of dive equipment. Because the light source is such an important safety tool for increasing visibility, locating other divers, or even emergency orientation, the depth rating of the light should be considered when choosing a light.
Some casual divers may be tempted to purchase the least expensive dive flashlight possible and this can be suitable however they should remember that these lights will usually not be well built as the professional or even serious amateur grade dive lights will be and that they may not stand up as well to normal use.
Dive safety is of prime importance in any type of diving, day, night or cave diving an essential part of dive safety is a diving light, which works, and is suitable for the area and depth of the dive.
While a very inexpensive flashlight for diving can suit the casual diver who rarely ventures down very far, it will have a less intense beam and may well be less durable than a more expensive diving light. It is still important to keep backups of different intensity of beams and to check them regularly.
Professional or casual divers may choose rechargeable batteries in order to avoid the annoyance of having to carry along packs of fresh batteries. The weekend diver may not require equipment that is rated for pro divers, but they do require sturdy well-built lights and batteries, which will last them much longer than their maximum dive length.
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Frequently Asked Questions...
Circuit Word Problem?
Someone please help me with this it looks a bit lengthy but its a quick solution (I always pick best answer)
A typical small flashlight contains two batteries, each having an emf of 1.50 V connected in series with a bulb having a resistance of 18.0 Omega. I already found the power to be .5W
The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance of both batteries when the power to the bulb has decreased to half its initial value? (Assume that the resistance of the bulb is constant. Actually, it will change somewhat when the current through the filament changes, because this changes the temperature of the filament and hence the resistivity of the filament wire.)
Answer:
Given:
power to the bulb, p = 0.25 W
resistance of the bulb, R = 18 ohms
voltage of the batteries in series, V = 3 volts
Find: combined internal battery resistance, r
Soln:
Let i = current
power = i^2 * R
0.25 = i^2 * 18
i = sqrt (0.25./18) = 0.118 A
For the whole ckt:
V = i ( R + r)
3 = 0.118 (18 + r)
solving for r:
r = 7.424 ohms
