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>Between 3000K and 4000K, if growing a small tomato bush, which would you go for?

I'm conflicted actually.

Probably the 4000k, and this is the rational: The increased blue light will reduce stretching in plant, at lower light levels.

Why I'm conflicted is I know 3000k works fine, I like the warm light/ find it relaxing, and red spectrum helps with flowering (important in a tomato plant).

Ultimately it might come down to what had more lux or was on sale that day XD !

>is the PAR38 shape all that important

PAR (parabolic aluminized reflector) kind of is important, the reflector bit in particular, as it means there is more light going in the right direction and reaching the plant. Light intensity is more important than exact spectrum.

>could I go for a regular globe shape?

Yeah you could, just put it in a reflector.

I really like this company's grow lights and have been using these. They're cold because you can wire them together and just use one outlet. In any case, good luck! Monios-L LED Grow Light Full Spectrum 30W 2ft T5 High Output Integrated Fixture with Reflector Combo for Indoor Plants https://www.amazon.com/dp/B072J2T878/ref=cm_sw_r_cp_api_i_xeE6Cb8PNDJ8Q

Thank you for the recommendation! This was one I had stumbled across, but wasn't sure if it was worth the price. Is there a discernible/significant difference between this product and, say, an LED shop light like this? Also, despite not having a case, is it essentially a plug-n-play product, or is there more I need to do to it? (It just looks so... delicate without a case)

Great guide. I have a very similar setup going right now. I used a desk lamp from Amazon. The lamp I linked has 2 models, one with a base and one with a clamp.

I went with a 15W SANSI bulb.. the closest Ikea is 2hrs away so I relied a lot on Amazon.

While i agree blurple lights may not be as effective as HID or quantum boards, i wouldn't necessarily rule out the blurple lights. For the price, the yields aren't so bad. It's just important to choose a better quality one. The one i linked, is low wattage however. I would suggest spending at least 100 dollars on a 250 actual watt blurple to ensure you have a decent yield of a small crop. If i were to suggest a "cheap" light, This would be my choice. For 20 ish dollars more, you can get 600w.

Problem is, they're not very efficient. Cob lights could also be an option. For this, the 100w cfl 6500k bulbs and lamps would be my choice. You would definitely get more wattage from the same money.

Edit: also, if you don't mind possibly having to send it back for another, you can get it used for 89ish usd