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Early underwater lights were fixed electric flood lamps or portable lamps with dry batteries for use by divers in standard diving dress. [3] Siebe Gorman & Company Ltd developed a model of portable lamp with a parabolic lens and attached to the divers corselet via a ball and socket joint allowing the diver to use both hands while working. [3]
The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]
The first mass-produced dry cell batteries came in 1896, and the invention of portable electric lights soon followed. Portable hand-held electric lights offered advantages in convenience and safety over (combustion) torches, candles and lanterns. The electric lamp was odorless, smokeless, and emitted less heat than combustion-powered lighting.
This includes things like battery-operated radios and fans, plenty of flashlights and batteries, indoor solar lights, first aid supplies and power packs to charge up your phones.
This handy number also boasts 21 hours of battery life, a backup charger and it's a flashlight! Nearly 42,000 five-star Amazon shoppers agree this dynamo is one to toss in your tote ASAP.
Anker PowerCore 13000mAh Portable Charger. ... plus there is a night-light LED. $10 at Amazon. Amazon. Best travel tech to tune out the noise ... which will certainly drain the battery. A power ...
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