Yes there new lights use a single cob chip they can focus the light better and its far less wiring to put the unit together but actually there much the same just a lot smaller
I would put the w90`s high up and in the middle of the grow space
Then I`d put the w100`s on the sides and angle them or just find the sweet spot for them, but you`ll want to move any tall plants under the w100`s as you`ll lose less light that way
With a cob led as the emitters are clustered together really close its easier for a tall plant to steal all the light
cob lights do a good job they get more penetration but if you just want to grow top bud and nothing lower down then 1w to 3w chips spaced out is best for g per w
There`s a lot of units out there to choose from and with cob chips making your own lights is very easy too
Just stick the chip to a heatsink, get a driver, wire it up to the cob led (2 wires) wire the driver up to a plug (2 to 3 wires) and if it needs it get a fan for it
but we don`t all have the tools and the time, so sometimes I have to buy nice leds and sometimes what ever I can get
People talk shit about "cheap no brand led panels" but you can get results from them if you're realistic about how much power they really use
but when you pay £100 for an led that draws 500w you have some pretty low expectations, I mean they advertise it as a "1200w grow light" but if it only uses 500w then I would only expect it to match a 400w to 600w hps at best
some of these really expensive leds and some home made ones do seem to be getting a lot of g per w but sometimes that`s just down to the grower and strain
Best thing about a light you make is how fast you can fit it when it breaks, where as sending off emails and sending stuff back, or waiting for people to send you parts to fix the light with, that`s all a hassle
If I pay £100 for a 300w to 600w led light and it breaks after a year what do I care ? a 600w hps bulb is £30 to £60, and I can normally get good parts from broken led units so they get reused
So I don`t think a lot of people consider that when talking about budget panels
Jeez when it comes to leds kinda feels like there`s too much about them in my brain, lol