10,000 kelvin bulb for good sidegrowth? - Lighting - Aquatic Plant Central

Go Back   Aquatic Plant Central > Special Interest Forums > Lighting

Lighting Science of Aquatic Lighting - Aquarium lighting is essential for healthy aquatic plants. Discuss proper aquatic lighting for your plants and fish here.

Reply
 
LinkBack Thread Tools Display Modes
Old 03-15-2004, 09:47 PM   #1 (permalink)
 
Join Date: Mar 2004
Posts: 156
iTrader Ratings: 0
Hanzo is a regular member
Default 10,000 kelvin bulb for good sidegrowth?

Below are a small part of an articel focusing on light on terrestial plants. There's much I don't get in this, since english is not my first language, but from what I understand i says that at a certain kelvin rate, the light seems like the light that can be found underneat a canopy of leaves, and this light will make the plant struggle to grow upwards towards the canopy to get to the light itself. On the other hand, and a nother specter of light, it works like direct sunlight, so the plant focus on good sidegrowth.

here's the articel in full:

http://194.236.255.117/akvarienet/me...antsfile54.pdf

And the part we are looking for:
5.3 Stem elongation
As described in section 2.2, far-red light reflected by neighbouring plants (or neighbours for short) decreases R:FR in horizontally propagated light, as ‘seen’ by vertically oriented plant surfaces (see Aphalo and Ballaré, 1995). This happens at low canopy densities, so it is especially important for small seedlings in sparse canopies.
The stems of many plants elongate faster if they receive additional far-red light from the side (see Ballaré, 1999, and references therein). In general, the magnitude of the response to far-red
light depends on the species, developmental stage, and other environmental variables such as blue light and/or photosynthetically active irradiance incident on the leaves. However, at low canopy densities there is no actual shading of leaves by neighbours. When measured under laboratory conditions, the stem elongation response to far-red light incident on the stem can be shown to have a very short lag (of the order of minutes in small seedlings) but continue for some time after the end of the stimulus (Casal and Smith, 1988a,b).
The photoperception of the lateral far-red light takes place in the growing internodes. In sparse canopies, the perception of neighbours is mediated mainly by phyB and probably sensitivity is modulated by phyA6.

Intensiteten och den blåa delen av spektrat verkar inte ha någon betydelse om man kollar på den bild han visar (Figure 11) där han jämför HighLight (HL) och (LowLight) och antingen Far-red eller Red.


This has been dicused on a swedish forum the last few days, and many of the skilled plantedud's there seems to swear to 10,000 kelvin bulbs for good growth and strong red collors. I have always been under the expercion that around 5500kelvin was the only way to go. Anybody here had any experience with bulbs in this range for a freshwater planted tank?

Also, I'm wondering if I should try this over my tank. What would be the best combination, two 10,000 kelvin 150W MH, or 4 70W, two at 5000 kelvin and two at 10,000 kelvin?

Kind regards,
Hanzo
Hanzo is offline   Reply With Quote

Advertisement [Remove Advertisement]
Old 03-15-2004, 10:38 PM   #2 (permalink)
Junior Member
 
Justin Fournier's Avatar
 
Join Date: Jan 2004
Location: Vancouver BC, Canada
Posts: 4
iTrader Ratings: 0
Justin Fournier is a regular member
Default

I have always been curious as to why more people didn't use the 10k's in FW, as they have a far nicer CRI then the commonly used 6700's or 9325's. I use both the 6700's and the 9325's together and find the results more then satisfactory. If I could only use one K though it would be 10ks. I think you could grow plants under any reasonable spectrum really.

Perhaps now is a good time to switch the 6700's out in favour of some 10's. I will consider it if I have a few extra bucks to blow.
Justin Fournier is offline   Reply With Quote
Old 03-16-2004, 06:48 AM   #3 (permalink)
Member of SCAPE
 
Join Date: Feb 2004
Location: San Juan Capistrano, CA
Posts: 885
iTrader Ratings: 3
iTrader Positive Rating: 100%
IUnknown is a regular member
Default

I have started to use a combination of 10,000K and 6500K. The internode length of the plants is more compact and my Micranthemum has started to creep. But it might be because the intensity of the bulb is higher because it is new. Although I have left one of the two 6500K 13 watt bulbs off.
IUnknown is offline   Reply With Quote
 
Old 03-17-2004, 11:55 AM   #4 (permalink)
 
Join Date: Mar 2004
Posts: 15
iTrader Ratings: 0
missphnx is a regular member
Default

Don't the 10,000k has a very blue light? I don't know.
I am trying to figure what bulbs to use myself. These 9325k's that everyone is talkign about. Where do you get them? Do they make them for a PC retrofit? I am getting a 2x44w PC retrofit kit from Ah Supply and I can't decide what Kelvin to use in it.
missphnx is offline   Reply With Quote
Old 03-17-2004, 12:40 PM   #5 (permalink)
Member of SCAPE
 
Join Date: Feb 2004
Location: San Juan Capistrano, CA
Posts: 885
iTrader Ratings: 3
iTrader Positive Rating: 100%
IUnknown is a regular member
Default

All glass uses them in there compact flouresant strip lights. There are cheaper places to get the but,
http://www.drsfostersmith.com/produc...&N=2004+113030
IUnknown is offline   Reply With Quote
Old 05-05-2004, 02:25 PM   #6 (permalink)
Senior Member
 
bharada's Avatar
 
Join Date: Apr 2004
Posts: 675
iTrader Ratings: 1
iTrader Positive Rating: 100%
bharada is a regular member
Default

I just redid the lighting on my 40gal with two 96W PC strips. Right now both have 10K bulbs which are very white...which would look awesome over a reef tank, but it doesn't flatter any of my red plants. I have some 8800K bulbs coming in on Friday so I'll try switching them up...try 10K/8800K or 2 8800K and see what looks best.

My old lighting was a combo of one 50/50 PC (ordered the marine Aqualight by mistake) paired with three NO 30W tubes (2 6700K + 1 18000K Power-Glo). Having the Power-Glo's purplish tint really did a lot to enhance the look of the red plants. Too bad there isn't as much variety in PC bulbs.
bharada is offline   Reply With Quote
Old 05-05-2004, 03:03 PM   #7 (permalink)
Member of SCAPE
 
Join Date: Feb 2004
Location: San Juan Capistrano, CA
Posts: 885
iTrader Ratings: 3
iTrader Positive Rating: 100%
IUnknown is a regular member
Default

I've read that 6500K is for growth and 10000K is for color. I switched to 10000K and had to change my dosing because things slowed down. I've been using a combination of 6,500K and 10,000K recently and things are great. Hanzo, I would do a combination just for the look, not to yellow not to white, but just perfect. If its a big setup and you are using four fixtures I don't know how you would mix the light. A lot of fixtures come with PC's to supplement the color. You use 6,500K MH bulbs and then 2 x 28 watt 10,000K bulbs to balance the color. Justin, I would stick with what you have, I think that is the ideal mixture. I just ordered a 6,500K MH with a 55 watt 9325 GE bulb to balance the color for a 20 gallon.
IUnknown is offline   Reply With Quote
Old 05-06-2004, 10:08 AM   #8 (permalink)
Senior Member
 
Join Date: Feb 2004
Location: USA
Posts: 739
iTrader Ratings: 1
iTrader Positive Rating: 100%
gpodio is a regular member
Default

The last photo in this article is of a fixture containing two Coralife bulbs,a 10000K and 67000K, you can easily see the difference using a camera. To the eye it's very difficult to see the blue. I like this combination personally even though I haven't used it in a while now, but had no problems growing plants with it that's for sure.

Consider however that not all 10000K bulbs look the same, some have more dominant peaks in their spectrum that give them a different appearance.

http://www.gpodio.com/overdrive_twin_strip.asp

Giancarlo Podio
gpodio is offline   Reply With Quote
Old 05-15-2004, 01:37 PM   #9 (permalink)
 
Join Date: May 2004
Posts: 492
iTrader Ratings: 0
freshreef is a regular member
Default

sorry to interupt but i never used other bulbs eccept 6500k, 4000k 3000k and sylvania gro lux . at the mom im having 6*39w t5 (3*6500, 2*3000 and one 4000k) do u realy think i should try one of those 10000k t5's?
whats the benefit of the 10000k in the planted tank? i always thought its for s/w only...
freshreef is offline   Reply With Quote
Old 05-17-2004, 04:35 PM   #10 (permalink)
 
Join Date: May 2004
Posts: 12
iTrader Ratings: 0
lemonblazer is a regular member
Default

I have a similiar question so I'll post here. I'm about to get a light with 6 x 65w bulbs. I'm wondering if using all 6500K bulbs will wash out the colors of my fish. Will using 6 10,000k daylight bulbs have the same affect? I want good plant growth but I don't want my tank to look washed out. Does it make sense to mix bulbs when they are both white?
lemonblazer is offline   Reply With Quote
Reply


Aquatic Plant Central > Special Interest Forums > Lighting > 10,000 kelvin bulb for good sidegrowth?

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Aquatic Plant Forum Replies Last Post
T6 bulbs to fit T8 end caps pineapple Lighting 8 10-08-2004 10:03 AM


All times are GMT -8. The time now is 03:08 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

Search Engine Friendly URLs by vBSEO 3.6.1