I was looking on a light site and they had two sets of HPS bulbs. For the same basic bulb,all specs were similar, they had two prices. on the 250W HPS bulbs one was 12.50 and the other was 53.00, same specs. WTF is up with that? Light Bulbs, Rope Lights, Halogen & Fluorescent Light Bulbs

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No more hps for me going t5 high output flourscent. No more ballast or exhaust fan needed. My hydro guy turned me on to this. Awesome.

and what the fuck is t5 thank you

In the past, fluorescent lamps were typically not a good choice for lighting indoor gardens. Today, with improvements in technology and increases in light output, fluorescent lamps may be successfully used for growing indoors. The introduction of the T5 H.O. (high output) lamp has proven to be a lamp nearly rivaling (and in some ways surpassing) MH lamp technology. (NOTE, do not confuse T5 H.O. lamps with "standard" T5 lamps, as the latter are too low in light output and efficiency to be considered for indoor gardening). Generally, a T5HO fixture may be placed closer to an indoor garden because the heat produced by the lamp is spread throughout a longer tube than HID lamps. For example, a 250 watt MH lamp has a lumen output of 28,000 lumens, while a 4 lamp, 4' T5 HO fixture has a lumen output of 20,000 lumens; however the heat output of the T5 is spread evenly throughout nearly 16' of fluorescent tubes, while the MH lamp has the heat concentrated in a tube less than 1' long. Therefore, in typical use, the T5HO fixture could be placed within a few inches of the garden, while the MH fixture might have to be placed 1 or 2 feet way. The closer placement of the T5 fixture would allow for increased light intensity for this garden. Typically these fixtures are used mostly for smaller sized gardens or seed starting applications.

ahh i use 1000w metal halide cool shades dont have much probs with heat due to the cool shades an air con 9000btu/h do have hot air heatin me down stairs but thats not to bad how do i attach pics do you know cheers

Cool. I dont really want to get into exhaust and all that jazz so this sounds pretty ideal. Is this the same idea as envirolites? Unless my quick bit of research is wrong, 4 ft tubes using only around 50 watts a piece also save you quite a bit on electricity. Plus if they're anything like envirolites the spectrum makes them much more efficient as well. Mogie, just how effective are HOT5's compared to HPS? Peace.

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Herb the gift, from the Earth, and what's from the earth is of the greatest worth. So before u knock it, try it first, you'll see it's a blessing and it's not a curse. - Ben Harper

For vegging these are great. The heat output in next to nothing. And you do save $$$. I still go with the big boys for flowering but the t5's are the perfect answer for ME when it comes to vegging.

mogie, my only concern about a T5HO fluoro vs a similar MH or HPS is the light intensity and foliar penetration- but you have addressed that concern by suggesting they be used for vegging instead of flowering.

As you note, the light output from a fluoro is spread out over the length of the tube, so the intensity of the light discharge is much lower per area of lamp surface and thus per area of lighted space.

Like you say, it sounds like T5HO fluoros would work pretty well for vegging your mums, but they probably would not give good bud density in flowering.

very cool man, I've been real interested in envirolites, whats your opinion on them (even for flowering)?

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Herb the gift, from the Earth, and what's from the earth is of the greatest worth. So before u knock it, try it first, you'll see it's a blessing and it's not a curse. - Ben Harper

"mogie, my only concern about a T5HO fluoro vs a similar MH or HPS is the light intensity and foliar penetration"

boom, hit it right on.