chimera Posted March 1, 2005 Report Share Posted March 1, 2005 has anyone ever tried 50,000k bulbs?! Quote Link to comment Share on other sites More sharing options...
nodle Posted March 1, 2005 Report Share Posted March 1, 2005 :lol: :lol: I here black lights where very common in the late sixtys early seventys maybe you could ask an old acid rocker:lol: :lol: Dave Quote Link to comment Share on other sites More sharing options...
reef Posted March 2, 2005 Report Share Posted March 2, 2005 No such things as 50k, just aquarium speak, the iwaski 50k are just blue. Maybe good for deep water coral, Quote Link to comment Share on other sites More sharing options...
Pies Posted March 2, 2005 Report Share Posted March 2, 2005 The same could be said for 13k/14k/16k. Looks like 10k is 'real', 20k is real. But the 'blueness' of a bulb has nothing to do with the actual kelvin rating. 20k Radiums are no where near as blue as 14k arcadias (or at leat the ones I have). Pie Quote Link to comment Share on other sites More sharing options...
RnB Posted March 2, 2005 Report Share Posted March 2, 2005 that was one of San Jays conclusions in advanced aquarist Quote Link to comment Share on other sites More sharing options...
lduncan Posted March 2, 2005 Report Share Posted March 2, 2005 I'm all for manufacturers giving PSD plots with bulbs rather than giving kelvin ratings. It gives a better idea of what "colour" they actually are. Layton Quote Link to comment Share on other sites More sharing options...
reef Posted March 2, 2005 Report Share Posted March 2, 2005 20k Radiums radium does not do 20k, they call them blue. Quote Link to comment Share on other sites More sharing options...
chimera Posted March 2, 2005 Author Report Share Posted March 2, 2005 yeah the guy at radium says he doesnt like to call them 20k's as its not a valid kelvin rating for them hence why they're just called "blues". he says people call them 20k's coz that is the closest kelvin rating they can guesstimate based on colour emitted. different brands vary greatly. all down to personal taste i guess i was just intrigued that iwasaki had 50k bulbs, couldnt imagine how they can get any "bluer/whiter" than 20k's. marketing? i have read alot that iwasaki 250W 6.5k's and 10k's are the best you can buy (or rather people rate them very highly in regards to their actual kelvin rating being close and longer lasting) or is this just another rumour? i got sold NARVA 14k's by the guy at radium. happy with them, but i havent see enough tanks in this k range to compare properly. Quote Link to comment Share on other sites More sharing options...
lduncan Posted March 2, 2005 Report Share Posted March 2, 2005 i have read alot that iwasaki 250W 6.5k's and 10k's are the best you can buy (or rather people rate them very highly in regards to their actual kelvin rating being close and longer lasting) or is this just another rumour? Who knows. There is still a lot of crap you have to wade through in this hobby. With lighting at the moment it really does come down to trying different options until you find what you like. My last change of bulbs I got 20k CoralVue's, personally I'm not happy with them. They looked nice but coral colours are crap at the moment. I swapped one out with one of the old Venture 10k bulbs I had, and things are starting to colour up well down that end of the tank. Funnily enough the light colour difference is not noticeable from one end of the tank to another. I might try Radium "blues" next. Layton Quote Link to comment Share on other sites More sharing options...
ben19185074 Posted March 2, 2005 Report Share Posted March 2, 2005 heard from someone before that 50000K are for deep sea stuff...a really dark blue Quote Link to comment Share on other sites More sharing options...
jetskisteve Posted March 2, 2005 Report Share Posted March 2, 2005 Layton, I heard that Coralvue were chinese made and werent that highly rated can you cofirm this? Sorry if I'm wrong. Quote Link to comment Share on other sites More sharing options...
Pies Posted March 2, 2005 Report Share Posted March 2, 2005 radium does not do 20k, they call them blue. Wrong. They are marketed by Osram/Radium as 20,000 kelvin 'crisp blue hue'. The kelvin rating is stamped on the box for all too see. Pie Quote Link to comment Share on other sites More sharing options...
reef Posted March 3, 2005 Report Share Posted March 3, 2005 Steve , i heard that the aquamedic bulbs you sell are also made in china, can you confirm, or are only the aquamedic skimmers made in china??. sorry if i am wrong Quote Link to comment Share on other sites More sharing options...
reef Posted March 3, 2005 Report Share Posted March 3, 2005 Wrong. They are marketed by Osram/Radium as 20,000 kelvin 'crisp blue hue'. The kelvin rating is stamped on the box for all too see. They might have 20k stamped on them but they are not 20k. just marketing for the aquarium trade. The specs from radium also dont say thay are 20k, just blue. Quote Link to comment Share on other sites More sharing options...
RnB Posted March 3, 2005 Report Share Posted March 3, 2005 Coralvue were chinese made all double ended made in germany under various OEM agreements but they where designed (ie the gas mixture) in china. Quote Link to comment Share on other sites More sharing options...
lduncan Posted March 3, 2005 Report Share Posted March 3, 2005 Layton, I heard that Coralvue were chinese made and werent that highly rated can you cofirm this? Sorry if I'm wrong. Don't know, but you'd be surprised what is made in China these days. The only issue I had heard previously about the 400W 20k's bulbs in particular, was that one of the initial batches of them would not fire. Coralvue apparently replaced these bulbs for affected people. Their other bulbs may be different, but personally I wouldn't buy the 20k's again. Layton Quote Link to comment Share on other sites More sharing options...
Pies Posted March 3, 2005 Report Share Posted March 3, 2005 They might have 20k stamped on them but they are not 20k. just marketing for the aquarium trade. The specs from radium also dont say thay are 20k, just blue. Then why do the specs on the RADIUM packaging say they are 20k? I had a quick search around the net, everyone who sells them calls them 20k and all the tests (like advanced aquairust) call them 20k. They must have kelvin rating, according to what they say (on there packaging, can't find a Radium web site) and what everyone else says they are 20k. So if they are not 20k what is the correct kelvin rating, can't be 0 kelvins (unless they are off). Pie Quote Link to comment Share on other sites More sharing options...
chimera Posted March 3, 2005 Author Report Share Posted March 3, 2005 Metal halide lamps of the same kind are different colors? Metal halide lamps operate by passing an electric arc through an arc tube that excites particles in the arc tube. When the metal particles reach an excited state they emit energy in the form of visible light. It takes 100 hours of operation before the metal particles stabilize and become a consistent color. All metal halides require 100 hours of operation before color and light output stabilize. All metal halides inherently have a slight color variation between individual lamps. Radium website, halide's for aquarium use: http://www.radium.de/e/produkte_overview.html?pe_id=14&pcon_list=1854,1855,2498,2569 As I said earlier in my post, when speaking to guy at Radium, I mentioned Radium 20k's and he said, no, they are Radium Blues - but 20k is the closest measurable kelvin rating we can give them. I guess they dont like to call them "20k's" because they vary from that rating between individual bulbs. I have also heard it becomes more and more difficult to 'K' rate bulbs over 10k? Quote Link to comment Share on other sites More sharing options...
reef Posted March 3, 2005 Report Share Posted March 3, 2005 Then why do the specs on the RADIUM packaging say they are 20k Its for the aquarium trade, they just stamp it on. Quote Link to comment Share on other sites More sharing options...
jetskisteve Posted March 3, 2005 Report Share Posted March 3, 2005 Thanks Layton. Quote Link to comment Share on other sites More sharing options...
cracker Posted March 4, 2005 Report Share Posted March 4, 2005 Im running VENTURE 250 watt MH. No kelvin rating tested...just blue. For the aquarium trade aswell as lighting up big buildings! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.