https://www.aliexpress.com/item/4000232096487.html?spm=a2g0o.cart.0.0.3da73c004HJJE9&mp=1 has come in. Box was beat up, marked marswell and diy led u home.
The color seems very accurate, just looking by eye especially at my skin, unfortunately no proper testing gear. Since it’s bright, it doesn’t look painfully blue - as is usually the case with other low intensity low cri high cct bulbs. A couple halogen bulbs evens out the CCT nicely (can’t use LEDs in 3 of the main fixtures and landlord won’t do a thing about it).
The actual base is plastic with air holes at the bottom. The LED aluminum mounts are only partially enclosed just enough to protect the LEDs, so there is room for a lot of air flow. Despite my original hesitance, I think this can more or less handle the 40 watts, and might even run cooler than all the 1600 lumen mainstream bulbs that have died on me…
What really needs to be known and I don’t feel like testing: what’s inside for the driver? I doubt a made in china bulb will have long lasting 130C rated japanese caps sadly…
I will update with pics after it has been on for a few hours to test heat…from what I’ve seen so far the heat is coming from the upper part where LEDs are lined up rather than the driver.
I’m pretty impressed and tempted to buy a few more…it’s REALLY HUGE, though, it pokes out way above the diffuser on my lamp, and would require removal of typical household glass cones or covers.
EDIT: Photos and CRI results https://photos.app.goo.gl/e51uJQ1jXSRyC62N6
EDIT2 5/4/2020:
I had to repload the CRI result… the image was missing, implying they may have DMCA’d it, but never got a notice from google… I would not buy from that aliexpress store with the way they bully, the only way that image went missing is they reported it.
They sent me “tests” with numbers very different from my old and outdated calibration tool (which only has a problem with too much green) on aliexpress…. (and of course, it was only “tested for 2 months”)
DIY led uhome if you are reading this it never pays to be a bully!
regarding the heat comment… it creaks when turned on, this implies that it is heating rapidly. so clearly there may be an issue, I have no way to measure the temperature.