why 5000k is better.

polyarcturus

Well-Known Member
ok brought up that link.seems like a reptile light i may have some of those in the garage...but did u mean poly 10000k? never seen a 1kt5 bulb i dont think lol ok writing this shyt down so i can order these lights projected date to start..feb 22..thanks again poly
yeah the link was for your side lighting, and yeah i meant 10k
 

gamestwin

Well-Known Member
ebay, dr. fostersandsmith, petmoutain.com, and horticulturesource are my favorite places to go shopping for T5 bulbs.


Poly your the man bro good looking out on this info..this is the ONLY thing thats holding me back NO LONGER..ill update you on my progress once i get all these tubes..thanks again.
 

polyarcturus

Well-Known Member
also found something of interest, the 3500k may be better than the 2700k/3000k goes further into the red spectrum, because it still contains some blue phosphor,
which emits some small amts of red. this is how the codes break down FB(code for a U bend fluorescent), 31 or 32, represents the wattage, 8(represents its a t8 bulb diamter) 30(means 3000k)

so with that said left graph is the 3000k and the right graph is 3500k, right graph has both more blue and red and but the reason the other bulb(3000k) gets a higher kelvin rating because it emits more green and yellow.

Untitled.jpg
 

Indoor Sun King

Well-Known Member
polyarcturus...my noob research indicated to me that 5000k was the way to go but somehow I was influenced to use only 6500/2700K so I replaced my 5000k with 6500K...now I'm thinking I should have stuck with my initial instincts.

I have twenty 23W CFL bulbs (eight 2700K, eight 6500K and four 5000K) but only 14 sockets

I'm just switching to 12/12 and was going to use 8-2700K & 6-6500K but after reading your post I believe I'll use 8-2700K, 4-5000K & 2-6500K. Does this mix seem okay to you?

Many thanks
 

polyarcturus

Well-Known Member
polyarcturus...my noob research indicated to me that 5000k was the way to go but somehow I was influenced to use only 6500/2700K so I replaced my 5000k with 6500K...now I'm thinking I should have stuck with my initial instincts.

I have twenty 23W CFL bulbs (eight 2700K, eight 6500K and four 5000K) but only 14 sockets

I'm just switching to 12/12 and was going to use 8-2700K & 6-6500K but after reading your post I believe I'll use 8-2700K, 4-5000K & 2-6500K. Does this mix seem okay to you?

Many thanks
yes that seems like a great mix, i would go x6 2700k, x6 5000k and x2 6500k or 5/5/4 both would still be very red dominant.
 

polyarcturus

Well-Known Member
also found something of interest, the 3500k may be better than the 2700k/3000k goes further into the red spectrum, because it still contains some blue phosphor,
which emits some small amts of red. this is how the codes break down FB(code for a U bend fluorescent), 31 or 32, represents the wattage, 8(represents its a t8 bulb diamter) 30(means 3000k)

so with that said left graph is the 3000k and the right graph is 3500k, right graph has both more blue and red and but the reason the other bulb(3000k) gets a higher kelvin rating because it emits more green and yellow.

View attachment 2490577
i would also like to make a note after further inspection of the graphs, the main difference is the intensity of light at 620/630 nm the 3000k is more intense but not as spread out. also note that this is not the "ideal" spectra of red, some more spread out is better than more intense at wrong spectrum.
 
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