littlejacob
Well-Known Member
Bonjourhi
from where do you buy that in europe? and for how much?
ty
You can have heatsink at good price from TME in E.U
Have a great day★
Bonjourhi
from where do you buy that in europe? and for how much?
ty
Thanks man I'll check it out!Bonjour
You can have heatsink at good price from TME in E.U
Have a great day★
I have been thinking about this for 2-3 days but I don't understand hps vs COBSo are you aiming to cover a 4'X8' or 32 ft²? If so,
Since heat is an issue, the efficiency (and efficacy) may affect your grow more than the direct electrical savings of the lamp. To compare heat in your 4'X8':
----------------------------------------------------------
2X 1000W HPS DE bare, 40.8% efficient =
960 PPFD
1184W of heat
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4xVero29 x 10 bars
10 x HLG-185H-C1400B x 43.90 euro = 439 + 45.07 shipping
40 x Vero29 x 24.79 euro = 991.60 + 112.67 shipping
1588.34
4xVero29 x 50.96 [email protected]@43.03% = 21.93 PARW x 4 = 87.71 PARW/bar
1230 PPFD
1163W of heat
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4xCXB3070 AD x 10 bars
10 x HLG-185H-C1400B x 43.90 euro = 439 + 45.07 shipping
40 x CXB3070 AD x 32.87 euro = 1314.80 + 112.67 shipping
1977.87
4xCXB3070 AD x 49.83 [email protected]@48.02% = 23.92 PARW x 4 = 95.71 PARW/bar
1346 PPFD
1040W of heat
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4xCXB3590 CD x 10 bars
10 x HLG-185H-C1400B x 43.90 euro = 439 + 45.07 shipping
40 x CXB3590 CD x 41.87 euro = 1674.80 + 112.67 shipping
2271.54
4xCXB3590 CD x 49 [email protected]@56.2% = 27.54 PARW x 4 = 110.15 PARW/bar
1712 PPFD
876W of heat
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In this example all the COB setups are very high intensity, maybe too high for a 4'X8'. So if you cut the number of CXB3590s in half to 980W, you get:
856PPFD
438W of heat
So that is equal intensity/efficacy as the 2000W of HPS but one third the heat.
The 40.8% efficiency is deceptive, you need to compare par measurements at the top of the canopy over the grow area and account for the extra heat that the hps provides.I have been thinking about this for 2-3 days but I don't understand hps vs COB
What is better
1000W HPS DE bare, 40.8% efficient and cheep price
Or
vero COB with running 2.1 a 40% efficient or 2.9 amps 37% efficiency
Clearly hps is more efficient and cheep. Would you still go with Vero at 2.1 amps due to directional light distribution or something ?
Also Vero29 to 3070 difference does not seem worth it to me. 11% more efficient and 24% more $. Not so nice.
Veros 29 to 3590 difference 30% more efficient and 24% more $, this makes sense
I think PPFD in Supras post already account for par measurements at the top of the canopy over the grow areaThe 40.8% efficiency is deceptive, you need to compare par measurements at the top of the canopy over the grow area and account for the extra heat that the hps provides.
.
ppfd does, but the efficiency does not.I think PPFD in Supras post already account for par measurements at the top of the canopy over the grow area
1000W HPS DE bare, 40.8% efficient =
960 PPFD
1184W of heat
-----------------------------------------------------------
Vero29 @[email protected]%
1230 PPFD
1163W of heat
I assume vero 29 @ 40% , PPFD and heat will look similar to hps
I think it does. Probably depending on how high you run it.Will artic 11 plus cpu cooler work for cxb3590?
I don't get it. It is not a distraction. I would really appreciate if people share their progress on similar projects here.Hey B,
Let me know if it's a distraction posting my bar developments up in here.
I made some progress 1- got the ac power connected to the driver. 2- I got the cob holders mounted using #4 screws and a slightly smaller drill bit, seems tight. 3- I polished up the sink some using 600 and 1200 grit wet paper it stills needs a good rub.
Does this look right???
Speaking of reflector losses we have heat treat operators that local age or heat treat small areas on very large parts. They use water cooled 5kw lamps. The reflectors must be polished after approx. 50 hours of use or the lamp fixture will be destroyed. All aluminum. And they are sealed, with air or argon "depending" cooling the lamp side. Water cools the reflector!According to Jair 60% of the light emitted from an HPS bulb has to reflect off the reflector to reach the target (70% by my calculations). With a perfectly clean reflector, 5% of that light converts into heat on the first bounce. Much of the light has to bounce several times so we end up losing 20% of the light before it exits the reflector.
As a thin film of haze and dust builds up on the bulb and on the reflector surface, a larger percentage will convert to heat on each bounce and more will be scattered/diffused in the wrong direction. We lose another 12% if the HPS is inside a cooled hood and that number increases as dust/film builds up on the glass of the hood as well. It seems like foliar feeding and soil dust would contribute a lot to the film/haze.
Jair explained that the 95% reflectivity cannot be restored by cleaning the reflector and must be replaced to maintain intensity. He suggests to replace it every year and especially if you have a dull reflector to replace it. It rubs me the wrong way because I would feel like I was being wasteful and that is why Gavita uses $35 reflectors. I have used the same aluminum HPS reflectors for several years nonstop. They did not look dull but it is true that my best HPS yields came when the reflectors were newest and yield did continually drop off with time, even when I rotated in new bulbs.
Jair talks about this at 1:07:50 here Adam Dunn show - S1E48 All About Grow Lights