On Sunday, 14 August 2016 23:07:12 UTC+1, alan_m wrote:
On 14/08/2016 21:59, Weatherlawyer wrote:


It's a tiltable garden light of the peg it in the soil variety and costs 42 dollars (out of stock.) No idea how much they are when they have them in.

Around the same cost when in stock, they are not the only place selling
them.

Wow what a surprise.

So how much does the jewellery involved cost or have they managed to refine quartz crystals to do them with?


You can buy the 5mW (red) laser diode modules for around 20 cents (US).
Chinese sellers can supply you with one each of red, blue and green 5mW
laser pointers for a total of around $7 US (including shipping) . These
will be the same type of component used in these projection lamps.

I looked up some stuff about the crystals. I have no idea what they dope them with but presume it is a relatively simple electrical process that can be mass produced. I gathered that the gems required for blinding people are some of the cheapest.

I dare say that most superpowers are already stocked with such things, the average US Marine squad seem to have one for fighting naughty Transformers with. I am surprised that they hadn't found out about such things before they came here having wiped out biological life forms on their home planet but what do you expect from sentient machines? Eh?