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Old 08-14-2006, 11:28 AM
 
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Default Vivarium lighting options

The recent hot weather has forced me to reconsider the available vivarium lighting options, from incandescent bulbs to LEDs. The results may (or may not) surprise you:

http://frogroom-podcast.blogspot.com/

Comparison of lumen/watt (very rough):
T5 90
T8 80: 20% of the input energy converted into light
Metal halide 60
CF 50
Mercury vapour 40
LED 25: Modern lamps over 100 but these are very expensive
Halogen 20
Incandescent 15, depending on power (7 for 15W, 20 for 300W):
Typically 5% of the input energy converted into light

So T5's are brighter than T8's but they are only slightly more
efficient, mostly because they pack more power into the same tube
length.
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Old 08-14-2006, 05:26 PM
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Any chance you found a light system that will grow plants, but not provide temp increase via the greenhouse effect?
:lol:
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Old 08-14-2006, 05:58 PM
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Quote:
Originally Posted by Dancing frogs
Any chance you found a light system that will grow plants, but not provide temp increase via the greenhouse effect?
:lol:
Only by breaking the laws of physics...

1 Watt of light energy provides the same heating as 1 Watt of infrared, when shone on a black surface.
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Old 08-14-2006, 06:49 PM
 
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Clayton, while that's true in terms of physics, it's not realistic in terms of practical application. So much of the light is broadcast out into the room, and some of it is used by plants, etc, so a 96 watt light is very different from sticking a 96 watt heater in your tank.

-Solly
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Old 08-15-2006, 12:50 AM
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Ah finally something to contribute that I found first (maybe). Check out these babies

http://www.naturallighting.com/order/store.php?crn=709


The rep from this company tells me that T6 bulbs are longer lasting and more durable than t5 and fit your T8 fixtures. Who wants to touch me?
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Old 08-15-2006, 11:57 AM
 
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Quote:
Originally Posted by Dancing frogs
Any chance you found a light system that will grow plants, but not provide temp increase via the greenhouse effect?
Yes I have:
http://en.wikipedia.org/wiki/Light_tube

If you're a cheapskate like me, it's called a "window"
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Old 08-18-2006, 01:47 AM
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Lumens tend to be a crude analysis of light.What you need to get is the information on the PAR(photosynthetically active radiation).I had a post where I was comparing CP's toT-5 but without a PAR meter I couldn't get anything concrete.
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Old 08-25-2006, 02:42 PM
 
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I know, I said so in the podcast. Sadly, the other statistics are not available from most manufacturers, so lumens per watt is the best I could do to get as wide a reporesentation as possible.
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Old 08-25-2006, 05:40 PM
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Is crude close enough for what we're doing? Sure a PAR would be nice but is it necessary? What units is that information in?



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Old 08-25-2006, 10:01 PM
 
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Default Thanks AJ

I think AJ's podcasts are a very nice service for froggers, and I am glad for the info they provide. There is at present no definitive source for information for our activities and gleaning knowledge here and there is all we can do.
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Old 08-26-2006, 02:00 AM
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Quote:
Originally Posted by defaced
Is crude close enough for what we're doing? Sure a PAR would be nice but is it necessary? What units is that information in?
If we want the most effiecient lighting for our plants.We could have thousands of lumens but if the plant can only use a small percentage of that for photosynthesis then we are wasting our money.Maybe if we contact the manufacturers of our lighting products then maybe they could tell us?
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Old 08-26-2006, 04:31 AM
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Quote:
Originally Posted by froggerboy
Quote:
Originally Posted by defaced
Is crude close enough for what we're doing? Sure a PAR would be nice but is it necessary? What units is that information in?
If we want the most effiecient lighting for our plants.We could have thousands of lumens but if the plant can only use a small percentage of that for photosynthesis then we are wasting our money.Maybe if we contact the manufacturers of our lighting products then maybe they could tell us?
Are you kidding?
Most of the time we are lucky to get a CRI, or Kelvin rating :roll:
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