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Yet the pins are cylindrical, is it because it's easier to manufacture?

I have confirmed that it does indeed lack Calcium. What is the simplest and cheapest way to supplement it? Thank you for your help!

I was sure heat dissipation is a function of surface area. As such, don't round and spherical shapes have the minimal surface area for a given radius? I would expect heatsinks to be as cuboid as possible to maximize the surface area within an envelope. Can someone explain this? Thanks!

I saw it on sale locally for $25 for 20 lbs, is it any good? If it's missing anything, how difficult will it be to complement it? I can't find calcium mentioned anywhere, does it mean it's missing? Here's the breakdown: NPK: 13 - 7 - 20 Mg, S: 1 - 5 N: Ammonium (NH4) 5.9% Nitrate(NO3) 7.1%...

Nice scrog! :)

Thank you for the information! :) I liked your journal!

In it to win it!

That's true :)

It all depends what we are used to :) I have been machining and fabricating metals as a hobbyist for a little over a decade, and compared to most metals aluminum no matter what grade is like putty to me :D You can do more or less all aluminum with hand tools as well.

Aluminum is a super soft metal, 20 minutes max with a hacksaw and you cut quite easily. One minute with a $30 jigsaw or a reciprocating saw with the right blade. Definitely not a big deal.

You bring up excellent points! I like your thinking and I completely agree. That's why I only consider this as a little side project and not as a basis for an actual grow.

One can dream ;)

Btw, I have made some CAD of water-cooled aluminum fixtures for DIY lights. At some point I'm planning to get a CNC and make some prototypes, maybe I will share the process here.

Yeah, that's why I thought to try the ones with the on-board driver, of course like you mentioned they have their own problems which might not make them very cost-effective. I was thinking to buy 6 of those 150w cobs for $66, heatsinks and fans for another 35, so 0.8 g/w might even be good...

I would say these are very important advantages, since we are not producing light for lighting's sake, we are trying to produce lights for plants to use. If the spectrum is better, wouldn't that compensate for lower efficiency? I'm a huge fan of such projects and experiments :) I'm definitely...

Few questions: 1. What do you suppose will happen if I use a variac with those for example? 2. Lets say I don't run them soft, will there still be any advantage to running them over HPS? 3. Can you recommend any low cost Chinese cobs to make a light that will be 'good enough'?

What do you think about those? https://www.aliexpress.com/item/LED-COB-Bulb-Lamp-Light-Beads-30W-50W-70W-100W-150W-220V-Input-IP65-Smart-IC/32738716696.html Will the 150W be any good? I posted here, but maybe it would have been smarter to post in this sub forum instead...

Waterproof UV led strips, kills anything in fractions of a second. One coiled on the outside circumference, one coiled around a core in the center. Maintenance free and cheap solution.

I saw these "150W" (knowing the way Chinese sellers lie, probably 10%-20% lower wattage than stated) on Aliexpress for $10 a piece. The driver is built into the board, so it feeds off 110V/220V AC directly. Has hundreds of positive feedbacks. I was wondering if it's worth making a grow light...

Sorry, but this thread and my answer are not about your use cases, they were addressed to the OP who just wants to grow weed cheaply, and is not researching indoor lighting.