Are 600w hps being discontinued??

Rocket Soul said:

There is also the issue in turning the light; hps is omni directional and you lose a lot of light on cannopy thru reflectors

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HID can be made into panels just like LEDs, with a bunch of lower wattage bulbs with smaller dome reflectors, all setup in a grid formation that is spread out more evenly over the canopy.

Then again, LED can be made into omni directional tube lights. Neither tech is really special in those regards IMO.

Drop That Sound said:

HID can be made into panels just like LEDs, with a bunch of lower wattage bulbs with smaller dome reflectors, all setup in a grid formation that is spread out more evenly over the canopy.

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Yeah, but your still achieving 180° throw thru the help of a reflector with very real losses. Led gets 120° throw without any costs.

Billy the Mountain said:

No, you're mistaken

The numbers I posted are empirical measurements taken with a Apogee ppfd meter and are not the theoretical gross output sphere measurements you may be referring to.

Nonetheless, lumens/watt is not the correct measurement to quantify useful light output for growing plants, ppfd is the measurement of interest.

These are taken from cocoforcannabis.com, Migro also posts independent light measurements with similar results.



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Sorry man, ppfd is not total output of a light source, even though you wish it to be.
LM is total light output measurement as you cannot test ppfd and know what total output this light makes, only how much falls on 1 spot, which is not how to measure total light output.
You say it is or it's not important is your opinion and your entitled to it, but it's not science, don't mix the two.

"theoretical gross output sphere measurements you may be referring to."

So all those companies that measure light in spheres are just fools you say... Interesting.
301H Evo on Samsung site shows 40LM for each 0.2w diode, Samsung are idiots too ?
Right...

Understand very simple thing, LM and PAR both represent total wavelengths at the growing spectrum, PAR just narrows that spectrum some more because of new conclusions but still not conclusive.

Still, LM is the only way to measure total light output of a light source.

Billy the Mountain said:

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Again, this doesn't mean anything, just means leds spread light better, we already know this.
If you think totaling a system which has a super reflector (led) to poor reflection HIDs and compare the 2 in ppfd, your just not understanding basic light principles

Under that CMH directly is more ppfd than any led system can deliver, when you start totaling the sides with the center point, the map downgrade drastically in HIDs, but again, that only prove leds spread better.
So in terms of compare, you simply can't.
They don't spread light in the same way, measuring spread in led (ppfd) vs measuring spread of hid reflectors is bro science.
they are not the same.
that's why total output of a system, not how much that system spread light, is a more logic way of comparing the two.