cobs are definitely serviceable, but strips will have better light distribution. led is probably your best bet imo, hid will have you needing a/c and more headroom than led would. plants are comfy into the low-mid 80s under led due to the lack/minimal presence of ir in the spectrum, and they can get fairly close to the lights without stressing provided you have good air circulation. higher humidity (60-70%) is preferable under led as well. a diy rig can be had for $1/watt or so, maybe less (been a while since i looked into it). the diy aspect is a little intimidating, but if i can do it (i did, no fires or electrocutions so far), i am confident that anyone with a pulse and enough attention span to watch a couple videos/read a little bit can do it too. its a rabbit hole to be sure, but its extremely satisfying upon completion, and it allows for customization to suit your space and preferences. the prebuilts are gradually getting cheaper too if you want plug and play. check the led sub forum for reputable prebuilt suppliers, and disregard anything that emits purple light or claims an absurd wattage or hid replacement. i can vouch for hlg and atreum, but i know theres plenty more out there.
