Good catch. I took digital electronics and robotics in high school. Actually won a national competition by designing, building, and writing the program to control a tracked robot to maneuver a course with black lines using photocells to determine when off course and adjusting the tracks to steer. That was a long time ago, and all these measurements and statistics I’m coming across while researching for lighting hurt my head. Lol
Might have to go with the 120’s then. Only 5 less watts per board but I think the spread wasn’t as good.
Not in 2700k unfortunately. I’ve been looking every few days. They have the 120’s in 3000k, which might have to do
Would there be a very significant difference between 2700k and 3000k for your application? Obviously for flowering only the 2700k is optimal, but would a 120 in 2700k be better than a 132 in 3000k?
The following PPFD mapping tables are for two Timber 48sams in a 4’x4’ tent, mapped using an Apogee MQ-500 with new sensor (older Apogee PAR sensor did not measure full red spectrum, this one measures full PAR spectrum: blue thru red wavelengths) centered in 6 sq inch squares on a 4’x4’ grid. Readings were taken at 6” height intervals from 12” to 48” above grid, at highest, medium, and lowest dimmer settings. The values in the tables, as described with other tables above, are PPFD readings divided by 1000 and rounded to one decimal point. This format has been used to make the numbers easier to read and to focus attention on meaningful similarities/differences in the measurements. One important factor to remember when reviewing the data: the front door of the tent was left open during mapping, for ease of taking the readings. This means that there is no reflectivity at the door, which slightly reduces the ppfd values in primarily the last two rows (a foot of distance) of the tables. For example: in the first table, (light level maximum, ht 12”) the bottom row (6” by the open door) the values in row H are about 0.1 less than the values in row A (6” nearest back wall), this difference is due to light escaping thru open door, rather than being reflected back inside tent. One other item worth mentioning: the 12” height gap has the least uniformity across the grid. I attribute this to insufficient distance between the grid and fixture for all diodes light cones to adequately spread for uniform coverage. For reference, 300-600 PPFD is veg level, 600-1000 PPFD is flowering level without supplemental carbon dioxide, 1000-1500 PPFD is flowering level with supplemental carbon dioxide. Enjoy!
I’m not sure which would be better. The coverage of the 132 in 3000k or the spectrum of the 120 in 2700k but not a good coverage. I suppose with 8-12 boards in a 4x4, I can mess with settings to dial it in though.
The fun begins... Two Cinderella 99 swirled screenless scroglines, 8th week, trichs starting to turn milky, 24” under 48sams, 1000 PPFD shining on their bleached tips. Probably looking at 1+lbs, dry, depending on how hard those nugs get. It’s ALL about light! Got some 8-main NYC Diesels and Super Silver Hazes getting ready to move in.
Looking forward to testing out DLI=65 on these babies, doing 13.5:10.5 after stretch. HLG PPFD to DLI converter: Converting PPFD to DLI
It wouldnt be coverage but how much blue vs red spectrum u get but if u look at 3k 35k 4k not that much of a diff. really Sent from my SM-J727P using Tapatalk
I ordered the 120’s in 3000k. I’m an HPS guy, so the 2700k was my first choice but none available. I guess we will see how 3000k flowers
Glad to hear it, can’t wait to see what you can do with it. Get a little far-red in there and you will be as happy as 2700k.
I’m gonna build a 4 qb120 light for now and flower that beast of an Orange Skunk plant under it. I moved my veg cabinet out of the room and built a scrog for her. She’s 24” x 36” and I made the scrog a little bigger. Once she finishes, I’ll make another 4 qb120 light and some far red for the center to replace the HPS on my 4x4. Should be some good pics coming in a month or so