countderekula

Question taken from other inappropriate area to here.
Has anyone tried using Color Transference filters(CT gels) as used to shift color temp(degrees Kelvin) as needed?
We use them in the film biz to make a 3200 Kelvin light 5500 Kelvin. Just thought it might be a cheap way to make the veg cycle more blue if you have straight HPS lighting.
I mean a sheet of quarter blue CT is like $5. As opposed to an adaptable bulb or entire additional $ystem.

vernonsupreme

what is the transparancy of the film? 90%, 95%? i'm sure if you work in the film industry you have a light meter and could check the values seperately and figure it up

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How to build a cool tube by VS

penguin

The problem with that is that filters don't really shift the spectrum, they block (absorb or reflect) light in certain wavebands, while allowing light at other wavelengths to pass. This changes the apparent color of the light and changes the spectrum available to the plants, but does not increase the total amount of light (number of photons) of the desired wavelengths received by the plant. The light absorbed by the filter ends up as heat.

Light that gets filtered out wouldn't hurt the plant, and filtering it doesn't help the plant.

It's more efficient to design a lighting system that produces more light at useful wavelengths, rather than producing a lot of light at useless wavelengths and trying to filter it out.

Correlated color temperature (K rating) is not very informative about the spectrum emitted by the lamp.


penguin

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penguin

Relatively new metal halide technology. The arc tube in a regular MH lamp is quatz glass. These use a ceramic arc tube. They are currently available in 250w and 400w. They are available in vertical (20,000 hours) and horizontal (15,000 hours). They can be operated 24/7, unlike regular MH which need to be turned off periodically. Phillips says that the ceramic MH lamps are "Optimized for operation on HPS ballasts."

I couldn't find any data regarding total radiant power.

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penguin

TL5 827 is available in 24w, 39w, 49w, and 54w. Correlated color temperature 2700K ("incandescent white").


TL5 830 is available in 24w, 39w, 49w, 54w, and 80w. Correlated color temperature 3000K ("warm white").


TL5 840 is available in 24w, 39w, 49w, 54w, and 80w. Correlated color temperature 4000K ("cool white")


TL5 850 is available in 24w and 54w. Correlated color temperature 5000K ("daylight").


TL 865 is avialable in 39w, 49w, 54w, and 80w. Correlated color temperature 6500K ("cool daylight").

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penguin

For reference, here's the spectrum of sunlight. The blue line is above the atmosphere, the orange line is at the surface.



Moonlight has a very similar spectrum, but at much lower power.

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Quantrill

Any progress in digitizeing the graphs?

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retired?

I have been looking into using LED as grow lights and found this info at ...ledtronics.com/ds/plantled/default.asp.

There is a good comparison between a standard 1000w HM bulb and LED's in commercial grow analysis as far as useful light spectrum from both types of lights. There a bit pricey for me at the moment. The technology is coming down in price.

You can find these links about 1/2 way down the page in the link above.
LED Plant Light-Bar FAQ
Commercial Growing Analysis and Recommendations (PDF file)Grow Light Technology Comparison (PDF file)PlantLED Technology
LED Plant Light-Bar AdvantagesDaylight Sensitivity Spectrums


I'm in another forum where they do a lot of R&D in plant growth and this is one of the things they are discussing. I didn't see much on the topic (kit Purple is cool, about 20 posts back) so this looked like the best place to share it.

some more info on grow light technology

threeb

The Osram Fluora 77,
I have 3 18Watt/77 - 550lumens at this wattage for each one...

As it seems i am ok for the vegetative stage with only these?

(bwt how do i make images appear inpost and not only as attachments)

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penguin

Note: knna's excellent Bulb Comparison Tool (and related posts) were split off to a new thread, to keep the data collection separate from the data analysis.


penguin

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