![](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Cap_lamp_1.jpg/220px-Cap_lamp_1.jpg)
A cap lamp is a lamp worn on the head or helmet. It is mostly used in an underground environment, like mines or during outdoor activities, e.g. climbing.
Patent
[edit]A patent for a self-adjusting bracket for use with cap lamps was awarded in 1985.[1]
GEN 4 and GEN 5
[edit]The two most recent variants of the cap lamp are the GEN 4 and GEN 5 models. The GEN 4 model, approved for use by the Mine Safety and Health Administration (MHSA), uses the headpiece of existing cap lamps, but retrofitted with new LEDs and electronics. The GEN 5 model is very similar to the GEN 4 model except with a more intense spot beam that can illuminate objects that are more than 40 feet away. Since GEN 5 is very similar to GEN 4, it has not been separately approved by MHSA. These lamps will last up to 50 hours with a six-cell battery pack. Energy-saving variants of these models, GEN 4E and GEN 5E, use a single lithium-ion battery.[2]
These new cap lamp variants that use LEDs follows research done by the National Institute for Occupational Safety and Health in the United States, comparing LEDs to traditional incandescent light bulbs, where they found that the LEDs improved hazard detection.[3]
References
[edit]- ^ 4530112, Cecala, Andrew B. & Volkwein, Jon C., "Self-adjusting cap lamp bracket", published Jul 23, 1985
- ^ "Improved LED Cap Lamp Designs". www.cdc.gov. Retrieved 2017-01-13.
- ^ Sammarco, John J.; Pollard, Jonisha P.; Porter, William L.; Dempsey, Patrick G.; Moore, Caitlin T. (2012-07-01). "The effect of cap lamp lighting on postural control and stability". International Journal of Industrial Ergonomics. 42 (4): 377–383. doi:10.1016/j.ergon.2012.04.001. PMC 4604055. PMID 26472917.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction