Estimating PPFD from PAR?

Rocket Soul

Rocket Soul

Well-Known Member
PAR and ppfd is (generally speaking) the same thing.
There are some ways of calculations in the math behind thread but i i nt think they will apply to well to this case. Just ask the seller to provide some ppfd measurements. They should if they wabt to sell it. But the light doesnt doesnt look too good, maybe try something different. 99% of amazon lights are crappy.
 
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ZHChris

Well-Known Member
In fact it should be PPF or YPF not PAR,You should ask them how many umol/j ,like 2.5umol/j *Operating power 100W,PPF should be 250umol/s
 
newbie2323

newbie2323

Well-Known Member
Thanks guys - I misspoke. Mean to say LUX to PPFD... They've provided a PPFD map. I just picked up a Lux meter and wanted to compare their claimed values to my measurements. Just need the conversion factor (0.016 ish) from lux to par/ppfd

2019-08-14 15_26_49-Window.png
 
newbie2323

newbie2323

Well-Known Member
Rocket Soul said:
But the light doesnt doesnt look too good, maybe try something different
Click to expand...
Can you elaborate? My plant seems to like it so far, but this is my first grow so what do I know. I guess I won't know for sure until harvest. What would you recommend for a single plant in a 2x2 tent?

photoaf (8).jpg
 
Rocket Soul

Rocket Soul

Well-Known Member
If it works for you and your happy with it just go for it. General buying advice:
- suspect anything on amazon and dont believe the reviews.
- suspect any light that doesnt list their components in details (brand name and wattage is not enough). Demand details on power supply
- demand a ppf/w from an independent lab
- lights that use optics or lenses are usually not great as they will reduce total light levels.

A lot of people around here use boards with midpower diodes, for example horticulture lighting group. Check out their R-Spec boards if you like.
 
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Ryante55

Well-Known Member
newbie2323 said:
Thanks guys - I misspoke. Mean to say LUX to PPFD... They've provided a PPFD map. I just picked up a Lux meter and wanted to compare their claimed values to my measurements. Just need the conversion factor (0.016 ish) from lux to par/ppfd

View attachment 4379258
Click to expand...
Looking at that ppfd map that light covers a 1x1 space with veg numbers

Edit wait I didn't notice that said 4' looks like that light covers a 2x2 with veg numbers
 
newbie2323

newbie2323

Well-Known Member
Rocket Soul said:
If it works for you and your happy with it just go for it. General buying advice:
- suspect anything on amazon and dont dont be the reviews.
- suspect any light that doesnt list their components in details (brand name and wattage is not enough). Demand details on power supply
- demand a ppf/w from an independent lad
- lights that use optics or lenses are usually not great as they will reduce total light levels.

A lot of people around here use boards with midpower diodes, for example horticulture lighting group. Check out their R-Spec boards if you like.
Click to expand...
Appreciate your input! Now I've got a bug to build my own. :)
 
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