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Reviews (2)
Feb 06, 2021
600 dB?!?! Do they even science?
5 of 5 found this helpful The eruption of Krakatoa in 1883 was so loud that it was heard 3,000 miles (5,000 km) away— and was "only" 180 dB. The Tunguska meteor created a huge explosion in Russia and was roughly the equivalent of a 1000 megaton nuclear bomb and was "only" 300-315 dB. The dB scale is a logarithmic scale, and the amount of energy doubles for each 3 dB. So 303 dB is double the energy of 300 dB. And 306 dB is quadruple the energy of 300 dB. So for this horn to be 600 dB it would require roughly 10^30 (1 followed by 30 zeros) times the energy of the largest nuclear bomb ever. While I haven't bought this horn, I'm going to go out on a limb and say that this horn doesn't come anywhere near 600 dB.
Jul 30, 2018
Better than expected, worth the money.
5 of 5 found this helpful I'll be honest and say that my expectations were low, for all the usual reasons. But this laser exceeded my expectations. The quality is reasonably high, the brightness is quite high, and beam quality is better than what you'd expect for a product this inexpensive. It also arrived fairly quickly, about 2 weeks to the USA.
I will mention that the green and blue wavelengths are not the same as the normal green and blue laser diodes— but this is a good thing! The green is more yellow-green, and the blue is more blue than UV. These wavelengths are more suitable for color mixing than the more typical green and blue.