Lessons learned in Black Lights. I've had several questions regarding how I get my graveyard to glow. It has taken years of mistakes, trial and error. And I'm still learning. but here are my basics.
#1) I use a reflective base. All my lettering and details first get a base coat of white paint, preferably gloss. If you have a white that naturally fluoresces that is a bonus.
#2) I use a glow or fluorescent paint, 'neon' is not the same as fluorescent. Most of mine is cheap craft paint from Walmart. Give it several coats, or pour it in, just give plenty of time to dry (like days). I have considered going to Wildfire Paints, but the cost has been prohibitive.
#3)
WAVELENGTH! As I've converted from Fluorescent tubes to LED, paying the extra $$ for the correct wavelength matters. 365nm is what is ideal for backlight effects. I went budget and my lights are around 395nm, which is more purple than I would like, but still provides a strong glow. Depends if you want the 'true' black light, or if you are OK with the purplish glow. 365nm are more expensive and harder to find.
#4) Placement.. Too close can be almost as bad as too far away. I've found straight on, or from slightly above works better than below and angled up. remember, that there are still shadows, so keep the angles and 'line of sight' clear.
I have LED floods similar to these. they are the 395 nm.
This display has 4x 4' Fluorescent black light tubes in 2 hidden shop light fixtures plus 3-4 of the LED floods.
Home Haunt, The Estate of the late Dr. Freakenstein lives on. Disappearing into the mist, only... 8339 Gordon Dr., Highland, Indiana, Estados Unidos 46322
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Here is the Enclosure I built for the Shop the lights. I still use these as they give the more true Black light with less purple. The enclosures were built to protect the shop lights from the elements.
The tombstone in front has just the Fluorescent tube black light on it. The ones behind have the 395nm LED floods. you can clearly see the extra purple glow that comes with the 395nm LED.