[svenski (OP)]

All i want to know is:

what is the best material to reflect sunlight for plant growth. I think its the blue part of the spectrum.

could you give me an insight into this please?

Duncan

[that mad man]

If its for indoors then reflective Mylar or white sheeting otherwise a bright white matt paint will do.

Mylar has about 98% reflectivity and I believe was developed for use in space.

You can get mylar or white sheeting from a Hydroponics supplier.

Bee

[paul.fr]

All i want to know is:

what is the best material to reflect sunlight for plant growth. I think its the blue part of the spectrum.

could you give me an insight into this please?

Duncan

erm...what are you growing me wonders!!!  beware of high electricity bills.

[eric l]

All i want to know is:

what is the best material to reflect sunlight for plant growth. I think its the blue part of the spectrum.

could you give me an insight into this please?

Duncan

I wonder !  One the one hand, I constantly see the greenhouses of professional flower growers lit with those orange sodium lamps during nighttime (or part of it) - Aalst is reputed as a centre for the culture of flowers.  On the other hand, the light you see in florist's shops is blue or blueish.  Maybe they need other light for keeping the flowers than for growing them.

[that mad man]

The main reason in using high pressure sodium lamps is because they have a high efficacy and give out many lumen's per watt.

Even though they may appear to be orange in colour, because of the sodium, they have most of the spectrum for growing plants including blue. Its just higher in the red spectrum.

Compared to a sodium lamp the light you seen in a florists shop would be very low.

Bee

[JimBob]

Ah, another cannabis farmer?

Just don't do it, you'll end up in big trouble, especially if you post about it.

[svenski (OP)]

Who mentioned cannabis?
its for my tomato plants!

[paul.fr]

Who mentioned cannabis?
its for my tomato plants!

i remember a time when we had a tomato plant at work, we convinced another guy that it was cannabis. Dried the leaves and rolled it. How we laughed as he convinced himself that he was high and started acting "spaced out"

[svenski (OP)]

Who mentioned cannabis?
its for my tomato plants!

i remember a time when we had a tomato plant at work, we convinced another guy that it was cannabis. Dried the leaves and rolled it. How we laughed as he convinced himself that he was high and started acting "spaced out"

i'll haf to remember that one.

not quite up to speed on this quoting business

[that mad man]

Hehe. I remember in the 60's a rumour that you could get high on dried banana skins.

Suddenly bananas doubled in price.

Bee

[paul.fr]

Hehe. I remember in the 60's a rumour that you could get high on dried banana skins.

Suddenly bananas doubled in price.

Bee

and that stuff you use for your cat to wee in!