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Not true. Luminus Devices, samsung, Nichia, Seoul all have COBs that are at least Vero level efficacy.

Then it will still work, but those aliexpress/ebay drivers have pretty dodgy descriptions. 1.5A @ 40V is 60W.

LEDs are already replacing stadium HID lights and street lights at places.

Credit to: https://www.reddit.com/r/HandsOnComplexity/comments/17nxhd/sags_plant_lighting_guide_linked_together/ May be a little old, may be a little double, may be posted before Here is a spectral reflectivity profile of a high nitrogen marijuana leaf (Jack Herer). About 90% of the green...

Besides the fact that the McRee curve is still the most widely used one. And according to the (old) DIN "standard" HPS should be nigh-useless but real life "favours" the Mcree curve.

And the DIN standard you posted is the old one.

Those DE Gavitas could have easily been pulled almost a foot closer to the weed. Some of the Spydr plants also got illuminated by stray light of the HPS. Gavitas should do more than 1 gpw. Edit:The test also featured 3 different brands of DE HPS and showed massive differences between the 3

Is it me or could the testers here have pulled the Gavitas closer to the plants? The Gavitas look like they could have been pulled at least 10 inches closer and some of the LED plants also got illuminated by the Gavitas

Citileds produces very high power COBs that can replace DE HPS in large warehouses. Their flagship CLU550 goes up to 500 something watts with efficiency around Vero levels.

No need for a reflector is still an advantage worth considering. And even with a highly reflective reflector the losses are still significant I do agree that for a micro-grow your weedbulbs are likely more cost effective, at the very least in the short/mid term. 30 dollars for almost 100 watt...

Short answer: Yes 50W max output with 40V is 50/40=1.25A. According to page 5 of the CXB3070 datasheet, it pulls at most 35 volt at +-1.25A http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/ds%20CXB3070.pdf So that driver will power 1 CXB3070...

Many LED bulbs do have the advantage that if you remove the cover/diffuser that they have directional SMDs, or a cob in it which means they don't require a reflector and won't have reflector losses. CFLs are omnidirectional by design and will have reflector losses. GE brightstiks are good value...

LED has the advantage of a tighter beam angle which improves efficiency over an HPS. CFL doesn't share that same advantage.

Put a 100 watt heater in a closed box and it will make the box just as hot (not more, not less) as a 100 watt light. 1 watt is 1 joule every second. One joule is always 1 joule and will always heat things just the same. It's different when there are plants involved though since photosynthesis...

Photosynthesis is an endothermic process isn't it? Light(energy) that's being used for photosynthesis is stored in the biomass and won't become heat energy unless you start burning it. Not all light output is used for photosynthesis though so a portion of it will become heat energy directly. In...

"inverse square law" doesn't really apply in situations with reflective walls. You'll have some reflector losses in that case but the light doesn't just magically dissapear

The big benefit of LED for commercial applications is that for example a room can handle at most 5000 watts of lights before heat becomes too much to handle, you can replace 5000 watt of HPS with 5000 watt of LED and have an increased yield. The increased yield pays the whole investment back and...

Oh no, your 1000 watt DE unit has higher PAR ratings that a light that uses 3 times as less energy. The horror

Your DE gavita(I guess) unit is a 1000 watt unit right? You'd need multiple units unless you can somehow get a CXB unit that's 650+ watts or so. And most units don't go above 350 watts. The unit from pacificlight pulls 320-340W so you'd need multiple. It's not that making a 700 watt unit is...

Very tired, confused with CFL. Low point from my part.