- Mar 8, 2004
Akyu said:THANKS MONTY!
I got us a red led on Monday evening AND put in an order for a red UV light with nm of 350 which should be totally dark for Ossie to see.
I'm glad that helped! I'm a little confused about what "red UV" means-- I thought UV stood for ultraviolet, but ultraviolet is "bluer than blue," so it can't be red... 350 nm sounds pretty ultraviolet to me, though... I'm wondering if "red UV" is a marketing gimic for reef tanks, in that it's UV "black light" that makes some corals flouresce red or something like that... Unless I'm misunderstanding, I think you may have been misled, though-- a 350nm light will be so far shifted to the blue direction that humans can't see it, but many cephalopods, quite likely including Ossie, can see UV... It's possible 350nm is far enough "blue" that it's outside ossie's visual range, but you won't be able to see it, either.
In general, UV lighting is interesting to humans because there are pigments, including some in a lot of reef tank flora and fauna, that absorb the invisible UV light and re-emit it as visual light, so you're making the stuff in the tank glow like a black-light poster. I guess it's possible that the "red UV" would make stuff glow red in a way that will provide indirect light to see Ossie with, but that Ossie wouldn't see, but it seems likely that even though some stuff will glow red, some other stuff will glow in the blues and greens that Ossie hides from, or that she'll be able to see the UV from the light itself...
Since the red LED flashlight seemed to work, I think you're best bet would be to get tank lighting that also uses red LEDs -- just using google, it looks like there are two main types of red LEDs, that emit at 660nm and 625nm... the 660nm will be more likely to be invisible to Ossie, but is also harder for humans to see... nevertheless, if you can, it's probably better Ossie-viewing for humans to get brighter 660nm than the 625nm.
If you feel ambitious, it's probably not too tough to buy a bunch of red LEDs at somewhere like Fry's or Radio Shack and make your own lighting... just make sure that you get the right size resistor(s) to go in series with them so they don't fry... and maybe use a transformer so they're running on 12 volt DC or something like that instead of directly on wall current.
I'm skeptical enough about this "Red UV" stuff that I'll be very surprised if it works, but it's possible I'm just not correctly understanding what it is.