#89FE05Radioactive (#89FE05) is a very light, vivid green with an OKLCH hue of 135°, lightness 0.89 and chroma 0.259. It sits on the transitional side of the color wheel. In practice it behaves as a mid-weight working color for secondary surfaces and editorial blocks.
| HEX | #89FE05 |
|---|---|
| RGB | rgb(137, 254, 5) |
| HSL | hsl(88, 99%, 51%) |
| HSV | hsv(88, 98%, 100%) |
| CMYK | cmyk(46%, 0%, 98%, 0%) |
| CIE Lab | lab(90 -64.8 85.6) |
| OKLCH | oklch(0.892 0.259 135) |
Under warm 2700K interior light Radioactive shifts subtly: drifts toward yellow-green; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 2.2), so it is a lighting-stable choice.
#9cf800 — ΔE 2.2, shifts subtly: drifts toward yellow-green#94ff00 — ΔE 1.0, shifts only faintly, with no single dominant change#89fe05 — ΔE 0.0, is virtually unchanged#88ff0e — ΔE 0.3, is virtually unchangedTest Radioactive in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 1.29:1 and against black 16.24:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid white text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#daffc7 · #89fe05 · #64bc00 · #4b9100 · #346800 · #1f4200
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#89fe05 · #bcd800 · #c9b800 · #c99a00 · #c57e00 · #be6100
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#89fe05 · #31d6c9 · #60b500 · #009188 · #397100 · #00514c
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#89fe05 · #a3c491 · #bd3bed · #326500 · #1f4300 · #0d2400
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#89fe05 · #c7b8cf · #788c6d · #564c5b · #132705 · #030005
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#f6eff9 · #cdc5d1 · #a198a6 · #281d2e · #07010b · #89fe05
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#89fe05 · #d1b0e1 · #b253d9 · #79009e · #350048 · #000200
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#ffeee9 · #89fe05 · #bdc1e6 · #a55298 · #434364 · #121104
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#89fe05 · #9dc1f0 · #0082fa · #980030 · #450010 · #00051c
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#89fe05 · #86cae4 · #0093b9 · #79009e · #3c1100 · #04000a
#9AFF4F · #ACFF77 · #BBFF94 · #CAFFAC · #D7FFC2
#6ECF00 · #55A200 · #3D7800 · #265000 · #112B00
#9EF861 · #B0F18A · #C1EAAB
Its moderate chroma lets it work in mid-size areas — upholstery, secondary UI surfaces, editorial blocks — without overwhelming neighbors. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.