T5HO 54W (48") K comparisons

[imeridian]

That's sort of why I run my 9325K lamps first and last in my lighting cycle, it's more like sunset and sunrise than if I was running my dual daylight lamps during the same period.

If the average person takes away nothing else from all these examples, I hope they'll see the actinic photos and realize just how nasty it looks with plants.

[AndrewH]

Originally Posted by tylercrawford

Nice chart!

I could see some people go crazy over simulating sunrise and sunsets with the lower k range lights on at the beginning/end of phototropic period.

That coupled with flash bulbs for lightning and misters for rain!

I though it was pretty interesting as well.

Lookup the "robo tank" .

Originally Posted by indiboi

That's sort of why I run my 9325K lamps first and last in my lighting cycle, it's more like sunset and sunrise than if I was running my dual daylight lamps during the same period.

If the average person takes away nothing else from all these examples, I hope they'll see the actinic photos and realize just how nasty it looks with plants.

Even the Actinic and 10,000 K together don't look that good to me, my $0.02 worth.

[Madhun67]

i think you should get paid for doing this,thanks much!!!!!!!!!!!!!!!!!!!!!
great job
Dave

[bsmith]

Awesome job Drew, very tedious im sure but also very insightful!

[AndrewH]

Originally Posted by Madhun67

i think you should get paid for doing this,thanks much!!!!!!!!!!!!!!!!!!!!!
great job
Dave

Originally Posted by bsmith782

Awesome job Drew, very tedious im sure but also very insightful!

I really appreciate the feedback. Let's me know it wasn't for nothing.

Doing this actually helps me do my job better . When I know first hand what a 3500 K and a 4100 K light source look like, I can know better which to specify when designing a project. Not to mention me posting 'em up will help everyone else who might not have a clue what's the difference between them.

I plan to use this as a baseline (creating a standard) in which to test future bulbs I get. Plus I plan to start PAR testing and experiments to add to the thread hopefully providing info not available anywhere else on the net (at least not in one place).

I figured - I have the knowledge, experience, and curiosity to where I'm going to be testing my own equipment, heck I might as well post my findings on the forums to possibly help someone else too.

[AndrewH]

I need some feedback regarding the pictures in post #16.

Use the Kelvin scale above, in post #15, and judge which WB setting makes the colors look most like their K rating.

I need to create a standard so I don't have to photo new tubes/bulbs 15 times .

The custom/6000 K set as White looks the closest to me, but that would be kinna hard to reset as a custom every time I change out my battery in my camera. Which one outta the "standard" settings I have available looks the closest. Fluorescent H gets my vote. Maybe I'll get lucky and the camera will store the 6000 K custom even if the battery is taken out.

[bsmith]

Double post..

[rolloffhill]

Originally Posted by Madhun67

i think you should get paid for doing this,thanks much!!!!!!!!!!!!!!!!!!!!!
great job
Dave

Originally Posted by bsmith782

Awesome job Drew, very tedious im sure but also very insightful!

I agree, great asset to any community!!!

[imeridian]

I'd say the Fluorescent H too, when taking the Custom/6000K out of the running.

[kyle3]

a year plus later. . . thanks for this thread it's wonderful!

[AquaVu]

I second that !

[AndrewH]

My pleasure!

[Hilde]

This is pretty good thread but Kelvin ratings vary according to whom the manufacturer is. For example a philips 6500k bulb is not the same as a Zoo Med 6500k bulb.

[kyle3]

Hilde I'm interested in this info- can you remember what the source was on it?

cheers-K

[kid creole]

My hat goes off to the OP. What a thread.

Originally Posted by kyle3

Hilde I'm interested in this info- can you remember what the source was on it?

cheers-K

K ratings vary on bulbs because the K rating is for the spectrum of a black body radiator, a theoretical object that doesn't exist. The spectrum of a flourescent light is the product of variations in materials, ballasts, degradation, etc. The spectrum does not look like a normal, it has peaks and valleys all over.

Flourescent light:


A black body: