New light

https://www.amazon.com/gp/product/B07RM2G658/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&th=1 Had one of these in my tent.. Probably would do just fine for 3-4 plants but I felt it wasn't quite enough for the six in my tent. Check out the diary if you want to see. It's budget for sure but seems to be working! Happy growing! 👊

HLG LEDs are hard to beat. Check them out

You could get ~250w from something using Samsung LM301B diodes (or LM301H, but don't over pay for a letter) and it would easily replace your 400 HPS - an equivalent at the least. Go higher for better and still save money. Check specs, make sure they run at 1.4a or less... you can divide watts by volts to find amps. Amps x Volts = W.. know any 2 can figure out the other. Even if this costs 50-100 more, you will save that money over time and get longevity that is as good as any out there. if good heat dissipation, these diodes will last 50-60k hours before they hit 80% intensity. The cheapies could give you as few as 10k and cost you more per month to provide equivalent photons at a higher wattage. umol/J - efficacy, if at 1.4a or lower, you are looking at an efficacy of >2.7 umol/J (can't recall, but can guarantee it's higher than this) So, if an hps is ~1.7, thats 400-> 250W with LM301B running at 1.4A. Probably a bit more intense light, but negligibly so. Beside the diode, you need to care about the heatsink. If it doesn't give you a rating for this (google for heatsink measurement, i am brain-farting on the C/whatever/s lol) assume it's not good.. likely okay for ~.7A and maybe 1A. QBs have this issue. If a fan pointed on top can make it cool to touch, back in business, lol. Anyway, need to have a good heatsink for all the other htings i've said to come to fruition.. if you do the may on efficacy when comparing lights now and your old one, you can see your cost savings per month with your cost per kw-hour electricty from a bill. You'll have this light for ~5-7 years if you take care of it. You will see the cost savings per month that you calculated + it likely lasts longer than the cheapies. Now all you have to do is pick out equipment that fits your footprint. You have a good idea of what you want at this point. Save up a couple extra bucks if needed. you can provide near max DLI without CO2 at a decent price. ~300-350 DiY? give you ~650umol/s at 250w .. that's 650 in a m^2. if your space is smaller, it's a larger value. extra tidbits -- far red is good to mix in.. do not need many of them. lm301b are white. 3k / 80 cri .. 3500? may need to google temp suggestions, but 80cri is still more efficient that 90cri. Anyway, check my profile out. I have some links that are relevant to this. there's a reply i have to ctcan that goes over much of the same info.. do the math.. longevity and cost savings each month.. it'll be less money in the long-run in many instances.

Hi check out mars hydro sp250 or there ts range some great results from there lights and not too pricey compared to most other brands