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looks like the high output 4 footers are even 54W, while i think cfl get less efficent the longer they become. overall i think the masured ppfd reading of cfl are real low, refering to the posted example, that had been just a 100ppfd for a 24W at 1inch. BUT, how could you stuck 4 footers in a 3...

i guess BK78 is the expert for pulse here. can only guess a bit. the description of the non pro sounds like theyre using a quite cheap i2c ambient light sensor, the description is acurate. they do tell you very reliable if the is no light, little light or much light. there arent many having a...

i would absolute agree with the given advices here, that light there can too intense. on the other hand it all looks real good so far. maybe your parameters are good so they take it. you will see signs of bleaching and maybe some foxtailing, i cant see such atm on the pictures. after week 8 you...

luckily there are EC deskfans offered too since shorter. 5W for a 6". do like artic cooling pc fans. they serve me well and are completly noiseless. https://www.microcenter.com/product/600914/arctic-cooling-p14-fluid-dynamic-bearing-140mm-case-fan Fan Speed: 1700 rpm Airflow: 72.8 CFM/ 123.76...

thanks for the info. 8x 24W is 192W and T5 put out max 80 lumen per watt, your timber fixture should be closer to 180 lumen, with a higher ppfd output then the T5 for each watt and less losses due to reflections (more direct light). i would guess you have a similar ppfd by using the timber...

i have no doubt you bought a timber 400W 4000k light. curious, how many watts does your T5 deliver? we may can get a rough relation to the leds.

you will know more then me soon then. just trying to share all infos i can get and if this unit is rubish dont blame me :D(the unit linked above is at least not very pricey). the numbers you will get will speak for themself.

wow, thanks for the feedback. even if you dont find a feature to limit the range i bet as long youre not using UVA monos or FR monos the values should be comparable, halfway. its very cool that you have a apogee to compare to ! if i am right Tekniks tests are made a few years ago, there maybe...

you should really give it a try with lower intensity. it is of course hard to guess which ppfd you have in real, i would guess the manufactorer could give you a ballpark number beeing good for veg. basically you should encounter good healthy growth at 250ppfd in veg, if they can take a 400...

β-carotene as PSI should have a impact on the photoinhibition, to which degree, nobody knows. overview https://en.wikipedia.org/wiki/Photoinhibition there are lil deeper going scientific informations then this, but not that much.

your 4000k light should produce you more β-carotene then 3000k. also doubt its the color, looks like a intensity problem, go lower then 200w if they need it. is this a 3x3?

ive heard that Teknik isnt a fan of this HPL200P PPFD Meter . its not precise he said. @grotbags , where you able to compare your meter to something else? https://ledgardener.com/forum/viewtopic.php?f=15&t=6124 i didnt remebered right, in this thread they refer to the OHSP-350 would of...

lux is also off, you may can back calc it taking your ppfd converted to lux, used 3000k as preset. yea, about +45% for my s8 and it could work out for 3000k. btw. i havent found a conversion factor working with the same value my spectromaster does. well, the spectromaster doesnt convert...

couldnt find a comparsion to other devices, its prob too new. over at Led gardener there is a user of this unit. Salomentin linked a "cheap" spectrometer, not bad for the price. https://nanolambda.myshopify.com/products/xl-500-ble-spectroradiometer?variant=31947369906246

about a 50% of for me.

found a datasheet for the ams. https://static6.arrow.com/aropdfconversion/b652a4bdbbeaa4b6736c40f59b64f08dad0d464d/tmd4903_datasheet.pdf on paper it looks not bad in real it differs for me. even it doesnt like it, the sensor was flat to the light panel and the sensor was cleaned on the S8. also...

they do work nicely have to say, robust little lights.

on aliexpress they can be ordered directly, some offers include express shipping for about 230$. also saw that it looks like they include a small remote display which gets the data by bluetooth a android app can be used alternatively.

looks to me too that its BTed to your phone. haha, will give a nice back up for sure, while i hope your spectrometer will last you some time. its for sure a good unit to lend to friends.