The Best Deals Thread. Post Best Deals And Lowest Prices Links
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Marq1340
Well-Known Member
Nice! So what are the drivers that actually came with it? Does it have a waterproof coating or anything over the diodes?
brownbusta
Well-Known Member
They did come with the pair of ELG-240-48AB as pictured in the listing. The diodes seem to be Samsung, and they are very bright, but maybe someone who knows could tell from the zoomed in photo. Running it almost full brightness, one edge of the heatsink has bowed ever so slightly, although it has even pressure on all the hangers. I'll also try to add some pictures from the Dekrulier deal for $146 you posted a few days ago.
PJ Diaz
Well-Known Member
It's a cheap non-finned heatsink. Your diodes will run hotter than they would with a finned heatsink and as a result will be less efficient. You get what you pay for.
To be honest, those don't look like Samsung diodes. Sammy's are more rounded at the corners.
Marq1340
Well-Known Member
This may definitely be true, but the sunraise lights I have don't have that kind of setup and it's cool to the touch ten times out of tens.
(Though they are two different designs)
PJ Diaz
Well-Known Member
Here's a general idea of how heat affects lumen output of LEDs, taken from the Samsung LM301b datasheet:
Marq1340
Well-Known Member
Is it a given for that board to reach those sever temps?
Not sure how accurate this review is but I found it hiding amongst the many good reviews.
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WubbaLubbaDubDub
Well-Known Member
Well I’ll test my unit when it arrives to see what kind of numbers it hits.my new apogee is getting lots of use lately.
I’m not worried about overheating the unit or warping the heatsink. I’ll probably only run it around 40% for my cacti after testing it.
this board just needs to spread the light better than my 315CMH dimmed
JewelRunner
Well-Known Member
Most of the 480w panels from the reputable vendors on alibaba also come on aluminum sheets with no fins. Those solder connections look cold/ not great. What do the diodes measure? 301 is 3x3mm
PJ Diaz
Well-Known Member
There's a lot of shady sellers on Amazon. My first LED kit which was supposed to be a HLG kit, was clearly a knockoff when it arrived. Luckily Amazon protected me and I got my money back, even though the seller was uncooperative. I'm not sure what temps that panel might reach. My heatsinks are finned, and most of my stuff is DIY. I'm sure it's more efficient than HPS type lighting either way, but likely as efficient than some better quality boards. I'm a bit biased because they sent me a free light to test out, but I still think that the viparspectra xs series is the best bang for your buck on Amazon currently.
WubbaLubbaDubDub
Well-Known Member
Mine says it’s not arriving until may 17th but I can check when they arrive
I’ll be posting some par measurements too
WubbaLubbaDubDub
Well-Known Member
Leds don’t need finned heat sinks if the aluminum sheet is thick enough.
I see what your saying about cheap companies,thin sheets are garbage.
Example of good thick ones: HLG
PJ Diaz
Well-Known Member
That's true, however it's also true that they use those sinks to save costs on their prebuilt fixtures, and recommend finned sinks with their 288 boards. The more surface area you have to disperse heat, the better, and the cooler you can keep your diodes the better they will perform. There's really no two ways about that.
PharaohBud
Active Member
If you say "I'm not smart enough to find things on my own" I might think about doing it for you.
JewelRunner
Well-Known Member
you lose 4% efficiency at 60c/140f vs 20c/68f. Not a huge drop, finned heat sink runs maybe 100-110f sheet sink maybe 130-140. You probably gain 1-1.5% efficiency with a finned sink, negligible
PJ Diaz
Well-Known Member
Sure, but also finned heatsinks don't slump like that cookie sheet posted a few posts back is. Also once, you start adding up all the "negligible" efficiency losses from things like low bin/less efficient diodes, less efficient drivers, and such, your efficiency losses can easily top 35% compared to top tier fixtures. I'm not saying that's always a bad deal, but you do get what you pay for. I love great deals, but I like them for the long run not just for this week.
Marq1340
Well-Known Member
Price: $17.99
Code: PECULLOP + clip 45% off
Link: https://amzn.to/3aWSDof
Niote: 4.5L top fill humidifier. Reviews say that the white light can be turned off but the blue light that shows the water level can't be turned off so if you believe that is enough light to herm your plants avoid this. or just tape it up.
Photos:
Code: PECULLOP + clip 45% off
Link: https://amzn.to/3aWSDof
Niote: 4.5L top fill humidifier. Reviews say that the white light can be turned off but the blue light that shows the water level can't be turned off so if you believe that is enough light to herm your plants avoid this. or just tape it up.
Photos: