View Full Version : Question on spectrum
Was looking at SwissMJ's link (http://www.nlites.co.uk/cfl.htm) posted in becky's thread.
Was reading there charts and it was saying there 25000K (called bio-tropic basically purple) was great for cuttings and veg. Anyone use one with that high of a kelvin temp and how did it work out?
Hey dawg,
never used one here but it says mainly for Tropical & Freshwater plants.
also has this warning for land plants
Land Plants: Warning: All fluorescent lights emit UV light, PURple emmits proportionally the most. When using any fluorescent lighting with early seedlings or early cuttings they would be best be protected from copious amounts of UV. This is easily remedied with a single sheet of glass or perspex or plastic, between the fluorescent light source and the plant tops, a Propagator top is ideal
never heard or seen anyone yet use'n one myself but who knows
:pass:
Sticky_Budz
11-06-2007, 03:25 PM
Wish i could help you there bro but of course i cant so good luck with finding the info you need :D
swissmj
11-06-2007, 06:34 PM
hey dawg, i picked up one of those lights from a mate not to long ago. i havent fired it up yet but in a couple weeks when i have to start thinking about getting new seeds sprouted ill give it a go and let you know.
becky420
11-07-2007, 01:11 AM
i thought it was blue and red?
swissmj
11-07-2007, 05:39 AM
yep yep, took it out of storage this morning and plugged it in just out of curiosity. definately purple. i have these wall hangings in the the living room that glow under uv lights and i was hoping it would work. but the lamp just lit the whole room up in an eerie glow.
couple weeks and ill have sum haze seeds going
cheers swissmj
i thought it was blue and red?
Yeah Becky, the 6500K for veg and 2500K for flower is whats the norm.
We are discussing the purple one. It has a astronomically high Kelvin Temp at 25000K temp. Which I haven't seen anyone grow with. But the site was saying its good for veg and cuttings. I don't trust "sales pitches", I trust what other growers are doing. Why I was curious.
Thanks SwissMJ look forward to your results. If it works well might pick one up for veg. There spectrum chart the purple one had a much broader spectrum range. Which seemed to be good for plants. But like CB said maybe the UV output would cause damage.
becky420
11-07-2007, 12:18 PM
i converted those kelvin numbers and those 3 are very high..
6500k is
f is11240 cel.is 6226
2500k is
c-4040 -f 226.85
25000k is
f 44540 and cel is 24726
Becky,
I can see why you got confused "Kelvin Celcius" kinda thing.
But in Light:
That is "Kelvin" The number is what part of the spctrum the lamp produces. Not the heat temp of the bulb ;)
The "color" of light sources comes from a complicated relationship derived from a number of different measurements, including correlated color temperature (CCT) or Kelvin temperature (K), color rendering index (CRI), and spectral distribution. However, color is most accurately described by a combination of CCT and CRI.
The first factor in choosing a lamp color is the correlated color temperature. CCT is defined as the absolute temperature (expressed in degrees Kelvin) of a theoretical black body whose chromaticity most nearly resembles that of the light source. The CCT rating is an indication of how "warm" or "cool" the light source appears. The higher the number, the cooler the lamp color will appear. The lower the number, the warmer the lamp color will appear.
The K rating in a lamp model is a generalized form of addressing the color output of a lamp or CCT. The hotter the kelvin temperature gets, the bluer. 10k lamps seem to be a nice crisp white, while higher kelvin can go from a blue/white to very blue and lower kelvin seem more like that of sunlight (6500k). Metal Halide bulbs go up to 20,000K (commonly used in aquariums) providing the bluest light.