they are fifteen watt bulbs so you have 30 watts over all
Those bulbs are sold as replacements for incandescent bulbs, but are much more efficient, so for the same light, less wattage is needed. The 15 watt CFL bulb is supposed to give about as much light as a 60 watt incandescent bulb. But our "watts per gallon" criteria is based on fluorescent bulbs, or compact fluorescent bulbs, so the watts for that criteria is the actual wattage of the bulb, or 15 watts.Even though it says 15W = 60W? It says the compact flourescent bulbs uses 15 watts but puts out 60 watts. Light output is 900 lumens.
Yes, I realize that others have had good results with those bulbs. That is what is frustrating. It may only take small changes in the hood to make a big difference - more room between bulb and reflector, larger hood size, etc. And, I have even seen big differences in brightness of the bulbs between two of the same wattage, same manufacturer, same part number. My 10 gallon tank is jinxed.you know hoppy i built a hood bassed on your ten gallon design for my 29 gallon tank using four 25 watt cfl bulbs and a make shift high gloss white reflector made from flashing and i can see straight through my gravel and have actualy been able to grow all sorts of plants so i am very happy with the cfl bulbs
I have used the 6500K GE bulbs and let me tell you, they aren't that great for lighting...I took the CF bulbs out and put in the 15w incandescent bulbs that actually came with the hood. It looked like a dankly lit cave. The difference in the visible light was crazy. I'm going to leave the CF bulbs in for now and see if I get any noticeable plant growth difference. Maybe later I'll put in two 25 watt CF bulbs. At least to my eyes the 15w CF bulbs are 4 to 5 times brighter than the previous hood with a 15 w tube and no real reflector and the incandescent bulbs.
Thanks for the explanation though Hoppy. I'm gonna cross my fingers in hopes my 10 gallon isn't jinxed.
Eclipse sells Daylight bulbs that are compact fluorescent. This has a warmer tone which could help plant growth. http://www.thatpetplace.com/pet/prod/213954/product.webAny suggestions as to what brand / light spectrum I should go with instead? I was thinking of putting 2 20 watts in there in their place anyhow.
That's interesting! I had never considered that those bulbs might be producing most of their light at wave lengths that plants don't use. That could explain the really bad results I got with the bulbs. Since I plan to get rid of that tank very soon I won't be trying other bulbs, but at least I can now see where I might have been off track. And, that could explain why others had so much better "luck".I have used the 6500K GE bulbs and let me tell you, they aren't that great for lighting...
I swapped the standard bulb in my Eclipse 5 with a 15 watt 6500K and all it grew were aglae and insufficient plant growth. Makes sense because all that white light is just parts of the spectrum that plants can't utilize well.. especially green. Aesthetically pleasing results, but better off using it as a supplement.
The Colormax is 6700k. It's important to keep in mind that temperature ratings are not that important to plants.. the spectral graph is where it really matters. In this case, the Colormax can do a sufficient job. I don't know of any screw-in compact fluorescent bulbs that are outstanding in red and blue areas. On a budget, two 20 watt bulbs compared to a 40 watt power compact fluorescent bulb fixture would save you bundles of money.Thanks for the links! I wonder if that ballast bit would be too big or if it would fit in my hood. I'm sure the non spiral bulb will be loads better than the spiral ones I have currently too.
I don't see what output the Colormax is; 6500k, 8500k etc.
They're nice bulbs that can whiten a tank, which would be great if you happen to have a Freshwater red spectrum bulb.That's interesting! I had never considered that those bulbs might be producing most of their light at wave lengths that plants don't use. That could explain the really bad results I got with the bulbs. Since I plan to get rid of that tank very soon I won't be trying other bulbs, but at least I can now see where I might have been off track. And, that could explain why others had so much better "luck".
Nice, could you post us a picture of your current setup?I'm using 4 26 watt GEs over my 10 gallon in a custom HDPE hood with an aluminum foil reflector. I have two standard bulbs and two 6500K daylights. The color is great and the plants pearl like no one's business. I'm growing a thin film of diatoms but I think it is more a result of my homebrew CO2 dying than the lights.
Clever construction.Here's my hood. It's some high density polyethylene that my dad has laying around. The reflector is just some heavy duty aluminum foil. The cord, plugs, and porcelains were bought at Home Depot or Lowes, don't remember which. I doubt I'm seeing 100 watts of real light, but it sure beats having a standard fluorescent hood. The outer bulbs are normal whites, the two inside are daylights. I left the gap so I can expand it to 6 bulbs if I end up feeling the need. If I can find a 2 light, electronic ballasted 18 inch T8 fixture I'd just do 4 ODNO bulbs. Unfortunately, locally I haven't seen a fixture to work with.