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G'day Tim. A colour temperature of 3500K can take you adequately through veg and flowering though most would say it would ideally be higher than that in veg and lower for most of flowering. But it is a good all-rounder and will do the job. Typically, 50 watts of good quality LED (and there...

Hi Stardog - sorry I haven't been around for a while and only just saw your post. Bleaching seems like a problem some people encounter - and others never seem to have any issues with. I'm in the former camp so I I know how you feel! Brand new whizzbang lights but can't those issue free grows...

Hello again Tim - first off, according to those who know, you've made a good choice! I may be wrong but I think the 27K probably refers to the colour temperature (2700 Kelvin - very nice for flowering) rathe than light output. Which is a good job because 27,000 lumens of light in that little...

Great journal man. Concise, to the point, all the information that you need. And lovely pics.

Hey man - saw you'd already started your grow thread and went with the lights you mention at the start. Hope it goes well and trouble free for you. Let us know how you get on as there'll be plenty of micro-growers who find their simplicity and inexpensiveness attractive. Fingers crossed for...

Hey Dog - I'm not hugely knowledgeable when it comes to anything electrical but, fortunately, there are lots of people on here who are. Had to do a bit of thinking for myself but based it on the advice of those better informed posting in other threads. Mostly this one...

As Yuv says, if you can afford a to spend just a little more, go for: A Samsung F series, Generation 3 strip (I think, off hand that the Q series has a higher lumen per watt output but are too small for most people's uses but may be ideal for yours). Samsung also do a "horticultural linear" but...

Hiya Bob - :D. Guess I'm not really looking for medical advice, just advice about reliable manufacturers and suppliers, quality of diodes (esp as regards accuracy of stated wavelengths), possible build costs, materials I might need - i.e. on building a light fixture. Especially comparing the...

Hi - I want to use lighting to treat a chronic skin condition and would appreciate any help and advice that the clued up members on these forums would be able to give me. The most efficacious medical lighting currently uses 100w, narrow band UVB fluorescent tubes made by Phillips, selling at...

Hi - know Keep Calm this already answered this but thought this might be useful calculator. Can't vouch for it's accuracy though it did output exactly the same ppfd as his conversion factor for a given number of lumens. It'll also give you useful info on spacing, height from canopy, etc. Can...

Out of curiosity, which Eb2s are you running and how close to the plant tops have you got them?

Thank goodness - a better reason to do less wiring than me being a slacker.

That speaks to my original question - and confirms my thoughts. Cheers!

Sorry - didn't mean to go off topic and hope the heatsink/flat bar discussion has been of a some small use to you. I decided on the f-series because, here at least, as the total cost of lighting my little 2x2 space with either was almost identical, I went with the convenience of having to use...

I suppose if whatever the strip is attached to is getting warm, it's conducting heat away from it, even if not as effectively as it might with an aluminium PCB. Already got the strips so no more shopping for me. Maybe I should get the cheapest, adequate support that will conduct heat away as...

As you can see, I'm no expert, but it does come in various thicknesses. I'm guessing above a few mm it's going to be rigid over a 2ft length.

That's a handy tip. It definitely would save money and, if they don't actually require heat sinks I guess it won't matter that the metal is rather thin on these - I think about 1/40 inch in your parlance.

Thanks for the heads-up but I already checked Heat-sink USA - the cost of shipping to me is just shy of $80. More than twice the cost of the heat sinks themselves. Without the shipping they'd only be slightly more expensive than buying flat-bar here.

Exactly - that's why I want to use something to dissipate the heat rather than not bothering at all, which, as you say, is an option. The hassle and cost of obtaining heat sinks proper (and LED Gardner) led me to the flat bar/channel alternative.

Thanks for replies. Digikey customer service told me they didn't need heat sinks but I guess any help in dissipating the heat generated will improve their efficiency and lifespan. I'm planning on running them at 1.05 amps, a little below the test current, so that may help. Unfortunately, we...