What are efficient lights for starting seedlings (for garden) LEDs?

[cdev]

I'm looking for suggestions on plant starting lights.. Anything... These are also for working under...and startingt vegetable seedllings, and making the desk area more outdoor like hopefullly...

[Marco]

I don't know how relevant it still is, since technology moves on ... but doing some youtube searching about the flip chip COBs a few years back I ran across this video which suggested they were pretty decent.

[wraper]

There is no advantage in those Chinese red/blue (purple) lamps. Most of them are inefficient, flickering and probably not electrically safe garbage. Regular 3000-4000K LED lamps work almost as well as best full spectrum specialized lamps.

[Kleinstein]

The usual plants can use red and blue light. They look green because the green is not used.
So special lamps can have some efficiency advantage, but normal white LEDs are also not that bad, as they also have a maximum in the blue and phosphore part somewhere in the red / yellow. The low CRI lamps often have reduced green anyway.

Most plants can not actually use the full intensity of the sun and there is no real need to get the full intensity of the sun light.

[thm_w]

There is no advantage in those Chinese red/blue (purple) lamps. Most of them are inefficient, flickering and probably not electrically safe garbage. Regular 3000-4000K LED lamps work almost as well as best full spectrum specialized lamps.

That and, who wants a red/blue light in their room? It gets irritating after 5 minutes of actually being around it.
You can get $20-30 complete LED fixtures from home depot with 5 year warranty, 4,500 lumens+. Should be enough for seedlings with them right underneath.

https://homesteadandchill.com/using-grow-lights/

[cdev]

I don't know if any are worth the money. I just told my wife that temperature and 'overheat' destroy LED lights and that white lights are probably as good as red/blue and more pleasing light to the eye.. I certainly don't expect any miracles.. we just want to save money on starter plants..(which are hugely overpriced) and sprouting for greens.. /herbs / taste

Those actually look like they have some useful application areas.
Because they're large area, flat, and supposedly have a decently thick Aluminium back plate they have a relatively low Watts / square meter
dissipation requirement and could either be further heatsinked easily or reportedly run at something like 50% rated power without a heatsink / forced air cooling. 

Also being large area they're less likely to make shadows.

So it seems like a useful little panel for a work light over something like a soldering / inspection area or platform where one wants to photograph stuff etc. though a true ring light or illumination from multiple sides would be more ideal for some cases.

And being run from low voltage it would be easy to power them from a PC power supply or wall adapter or something one actually trusts to convert mains AC to LVDC as opposed to the case with most cheap junk AC powered LED lighting.

I wonder if the reliability would be good if run at 40-50% of their exaggerated "rated" wattage.

I don't know how relevant it still is, since technology moves on ... but doing some youtube searching about the flip chip COBs a few years back I ran across this video which suggested they were pretty decent.