Go for a standard-type fixture led ‘full spectrum’ or ‘sun’ LED (with UV & IR if poss) - plants do best outside in the sun so best to choose one that has all these things if you can.
I have two that fit in standard screw bulbs, then I use an old floor lamp :) These are what I use - flexible fixtures means I can move them around as the plants/weather changes too.
No - aim for full spectrum lights that are warm white (6500k), ideally with uv & ir to mimic the sun. One bulb is unlikely to give you a wide and even enough spread for 9 plants.
If it helps, these are what I use for my haworthias - growlight at about 8” distance, 12hrs a day. At 4” they can burn echeverias so move plants slowly into the brighter light.
Trying to improve plant quality by modulating what wavelengths from red/blue only really works when the entire set up is tightly controlled, or the plant really needs light signals to grow correctly - eg for cannabis the blue/red frequencies can be used to force the flowering process in the plant, to make it produce the active thc when the grower dictates, as photoperiodic cannabis is directly guided in it’s growth pattern by the availability of light.
A huge complex thing is growlights - basically it depends on what kind of light you want. Not all can be measured in lux, and a lot is down to doing the research and trial and error. You can find lots of guides in the cannabis growing side of Reddit :)
Nothing will beat the true sun for plants, we just have to recreate it as best we can but without solar flares or radiation!
Sunlight is not white, but a blend of frequencies of light (which then can get separated into rainbows) so you need to choose a temperature or K of bulb, usually this is split into cold / warm led lights for household fixture bulbs. For 99% of plants, warm is better.
Different units work for different bulb type- HPS/LED/fluorescent, and unless you have a lightmeter, you won’t know if you got the correct number, or if it puts out close to what is advertised. LEDs also are better at penetrating through canopies of plants, so can reach further more efficiently than old HPS tubes.
From wattage and bulb info, you can calculate what power the bulb is, but you also have to figure what distance away you want the lamp, as that dictates what power you need. If you double the distance of the grow light, you half the light getting to the plant - if you half the distance, your plant gets double what it was before!
This is mine I have 3 for houseplants :) and they keep a ton of succs plus aroids and BOP happy in Scottish winters at about 36” distance from plants, tilts in for a more focused light - plus have some UV & IR bulbs.
Edit - DO NOT LOOK DIRECTLY AT A LIT GROW LAMP. People forget to mention how dangerous they can be - watch out for kids or pets too.
I thought as much, Thanks for confirming.
Im thinking of redesiging the bucket entirely and moving to a 90l bin.
Probably a stupid question but could i use some new bulbs like these?
That way i could use all existing parts and move them avross to a new bucket.
https://www.amazon.es/Bombillas-Espectro-iluminación-eficiencia-energética/dp/B07VKHQJZY/ref=mp_s_a_1_15?dchild=1&keywords=luz+cultivo+interior+150w&qid=1598363122&sr=8-15 i had 2 of these which where ment to be 150w but obviously werent. You can see pictures of how they were working out with the other light in my profile.
Check out lamp bases! I rent and also don't have any way of hanging a ceiling lamp setup. I bought two grow lights and lamp bases for them that don't hang from Amazon. One clips to my window ledge, and the other is a standing lamp base. You just have to make sure you don't exceed the wattage for that lamp base with whichever grow light you find. The links might help the visualization:
https://www.amazon.co.uk/dp/B07VKHQJZY/ref=cm_sw_r_cp_awdb_t1_5GvgFbGZ0Q85V
https://www.amazon.co.uk/dp/B082YZGV9Q/ref=cm_sw_r_cp_awdb_t1_lJvgFbE3W776X
https://www.amazon.co.uk/dp/B07SQWFFYZ/ref=cm_sw_r_cp_awdb_t1_7JvgFb4426RV5
Also, for the standing one, I just left off the shade that comes with it. My plants have been loving this setup when they're on (grey days here in Ireland, even in summer), still kicking out new growth. And what's also great about both of these kinds of bases is that they have those movable necks, so you can aim and direct the light to cast wide rays of light over larger areas of your plants without having to move the plants from their current location. Ikea also makes a grow light that I hear is pretty good and can be put on a similar style base. Hope that helps!
I have this one covering 5 chilli plants: https://www.amazon.co.uk/gp/product/B07VKHQJZY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It works pretty well. I rotate some plants on the edge directly under the lamp every few weeks. We've got chillis growing in December using it.
The fan is sitting right behind the light! Anyway, it doesn't have a name so I am gonna link you the amazon: https://www.amazon.it/dp/B07VKHQJZY/ref=cm_sw_r_other_apa_i_5Wa1EbY2Y4ZEB