experience with Metal Halide?

[Nexogen]

Terrarium with 6 X T5 High Output 6500K Daylight Bulbs

[DavidCampen]

White LEDs will work well in providing the light color the plants need. It is only when you are looking to obtain maximum electrical efficiency that red LEDs may have an advantage over white. White LEDs will be about as efficient as T5 HO but have the advantage of being able to be tightly focused so that the LED fixture can be placed much farther above the plants.

I find that a blue LED helps to balance the visual effect of a red LED. I am using the combination of 1 blue LED and 1 white LED with 2 red LEDs. The light is still defintely red but I find it to be not too garish.

[Nexogen]

Let me be clear; I don't blame LED grow lights, I used Grow LED lights, but for living room 100W red, blue, etc LED is not to comfortable. Grow LED specter for plants is different comparative with aquarium specter LED lights but you can goo at an store specialized in Growing LED lights and try one.

[Nexogen]

...got today a new growing light iGrow 200w Induction Light Full Spectrum Daylight Bloom

[mexorchid]

Originally Posted by Nexogen

...got today a new growing light iGrow 200w Induction Light Full Spectrum Daylight Bloom

I have never heard of that before. A magnetic light? I guess it's strong and doesn't produce a lot of heat? How does that look like???

[Nexogen]

In fact the light is electromagnetic radiation but Induction Lighting is more efficient
I can see in the future...

[naoki]

That's cool. It is interesting to see how it will perform.

Induction is attractive because of the even frequency distribution and fairly high efficiency. I'm not sure how accurate the following calculation is:
http://www.inda-gro.com/pdf/MeasuringPlantLight.pdf
But in terms of efficiency (PPF/W not lumen/W), induction light seems to be about 25% better than T5 HO, and slightly less than HPS. But when they account for the fact that red light is more useful for photosynthesis (yield PPF), then induction become similar to HPS. The document has one LED in comparison (it has the highest efficiency, but I think it's red/blue type which most of you don't like).

Unfortunately, induction light has been rather expensive now, and I'm guessing that induction price won't fall down as fast as LED price.

[NYCorchidman]

Be careful with metal halide if you end up using that.
I cooked one cattleya badly under metal halide lamp.
I think you might want something that does not release too much heat.